Remove useless checks for NULL before freeing

This patch has been generated by the following Coccinelle semantic
patch:

// Remove useless checks for NULL before freeing
//
// free (NULL) is a no-op, so there is no need to avoid it

@@
expression E;
@@
+ free (E);
+ E = NULL;
- if (unlikely (E != NULL)) {
-   free(E);
(
-   E = NULL;
|
-   E = 0;
)
   ...
- }

@@
expression E;
type T;
@@
+ free ((T) E);
+ E = NULL;
- if (unlikely (E != NULL)) {
-   free((T) E);
(
-   E = NULL;
|
-   E = 0;
)
   ...
- }

@@
expression E;
@@
+ free (E);
- if (unlikely (E != NULL)) {
-   free (E);
- }

@@
expression E;
type T;
@@
+ free ((T) E);
- if (unlikely (E != NULL)) {
-   free ((T) E);
- }

Reviewed-by: Brian Paul <[email protected]>

6 files changed, 12 insertions, 25 deletions

diff --git a/src/gallium/state_trackers/egl/x11/glxinit.c b/src/gallium/state_trackers/egl/x11/glxinit.c
index 34be89a1197..b9c51279100 100644
--- a/src/gallium/state_trackers/egl/x11/glxinit.c
+++ b/src/gallium/state_trackers/egl/x11/glxinit.c
@@ -217,9 +217,7 @@ __glXFreeDisplayPrivate(XExtData * extension)
 
    priv = (__GLXdisplayPrivate *) extension->private_data;
    FreeScreenConfigs(priv);
-   if (priv->serverGLXversion)
-      free((char *) priv->serverGLXversion);
-
+   free((char *) priv->serverGLXversion);
    free((char *) priv);
    return 0;
 }
diff --git a/src/gallium/state_trackers/egl/x11/x11_screen.c b/src/gallium/state_trackers/egl/x11/x11_screen.c
index 47d9a69c7dd..effac0e711d 100644
--- a/src/gallium/state_trackers/egl/x11/x11_screen.c
+++ b/src/gallium/state_trackers/egl/x11/x11_screen.c
@@ -95,10 +95,8 @@ x11_screen_destroy(struct x11_screen *xscr)
 {
    if (xscr->dri_fd >= 0)
       close(xscr->dri_fd);
-   if (xscr->dri_driver)
-      free(xscr->dri_driver);
-   if (xscr->dri_device)
-      free(xscr->dri_device);
+   free(xscr->dri_driver);
+   free(xscr->dri_device);
 
 #ifdef GLX_DIRECT_RENDERING
    /* xscr->glx_dpy will be destroyed with the X display */
@@ -106,8 +104,7 @@ x11_screen_destroy(struct x11_screen *xscr)
       xscr->glx_dpy->xscr = NULL;
 #endif
 
-   if (xscr->visuals)
-      free(xscr->visuals);
+   free(xscr->visuals);
    FREE(xscr);
 }
 
diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index 4b81755dcfa..7e915567a43 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -168,10 +168,8 @@ xmesa_init_display( Display *display )
             xmdpy->screen->destroy(xmdpy->screen);
             xmdpy->screen = NULL;
          }
-         if (xmdpy->smapi) {
-            free(xmdpy->smapi);
-            xmdpy->smapi = NULL;
-         }
+         free(xmdpy->smapi);
+         xmdpy->smapi = NULL;
 
          xmdpy->display = NULL;
       }
diff --git a/src/gallium/state_trackers/glx/xlib/xm_st.c b/src/gallium/state_trackers/glx/xlib/xm_st.c
index ee425ec2b59..7b54df5998c 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_st.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_st.c
@@ -278,10 +278,8 @@ xmesa_create_st_framebuffer(XMesaDisplay xmdpy, XMesaBuffer b)
    stfbi = CALLOC_STRUCT(st_framebuffer_iface);
    xstfb = CALLOC_STRUCT(xmesa_st_framebuffer);
    if (!stfbi || !xstfb) {
-      if (stfbi)
-         free(stfbi);
-      if (xstfb)
-         free(xstfb);
+      free(stfbi);
+      free(xstfb);
       return NULL;
    }
 
diff --git a/src/gallium/state_trackers/vega/shaders_cache.c b/src/gallium/state_trackers/vega/shaders_cache.c
index 29463843bb7..eceae54051e 100644
--- a/src/gallium/state_trackers/vega/shaders_cache.c
+++ b/src/gallium/state_trackers/vega/shaders_cache.c
@@ -238,12 +238,9 @@ combine_shaders(const struct shader_asm_info *shaders[SHADER_STAGES], int num_sh
 
    ureg_destroy(ureg);
 
-   if (temp)
-      free(temp);
-   if (constant)
-      free(constant);
-   if (sampler)
-      free(sampler);
+   free(temp);
+   free(constant);
+   free(sampler);
 
    return p;
 }
diff --git a/src/gallium/state_trackers/xvmc/subpicture.c b/src/gallium/state_trackers/xvmc/subpicture.c
index f9f646b7496..8e96ce66dc0 100644
--- a/src/gallium/state_trackers/xvmc/subpicture.c
+++ b/src/gallium/state_trackers/xvmc/subpicture.c
@@ -115,8 +115,7 @@ static Status Validate(Display *dpy, XvPortID port, int surface_type_id, int xvi
 
    subpictures = XvMCListSubpictureTypes(dpy, port, surface_type_id, &num_subpics);
    if (num_subpics < 1) {
-      if (subpictures)
-         free(subpictures);
+      free(subpictures);
       return BadMatch;
    }
    if (!subpictures)