gallium/drivers: Sanitize NULL checks into canonical form

Use NULL tests of the form `if (ptr)' or `if (!ptr)'.
They do not depend on the definition of the symbol NULL.
Further, they provide the opportunity for the accidental
assignment, are clear and succinct.

Signed-off-by: Edward O'Callaghan <[email protected]>
Signed-off-by: Marek Olšák <[email protected]>

3 files changed, 4 insertions, 4 deletions

diff --git a/src/gallium/drivers/i915/i915_context.c b/src/gallium/drivers/i915/i915_context.c
index 05f8e93ddea..82798bbb543 100644
--- a/src/gallium/drivers/i915/i915_context.c
+++ b/src/gallium/drivers/i915/i915_context.c
@@ -160,7 +160,7 @@ i915_create_context(struct pipe_screen *screen, void *priv, unsigned flags)
    struct i915_context *i915;
 
    i915 = CALLOC_STRUCT(i915_context);
-   if (i915 == NULL)
+   if (!i915)
       return NULL;
 
    i915->iws = i915_screen(screen)->iws;
diff --git a/src/gallium/drivers/i915/i915_resource_buffer.c b/src/gallium/drivers/i915/i915_resource_buffer.c
index 9fb3855a37e..fb2e53b014f 100644
--- a/src/gallium/drivers/i915/i915_resource_buffer.c
+++ b/src/gallium/drivers/i915/i915_resource_buffer.c
@@ -72,7 +72,7 @@ i915_buffer_transfer_map(struct pipe_context *pipe,
    struct i915_buffer *buffer = i915_buffer(resource);
    struct pipe_transfer *transfer = util_slab_alloc(&i915->transfer_pool);
 
-   if (transfer == NULL)
+   if (!transfer)
       return NULL;
 
    transfer->resource = resource;
diff --git a/src/gallium/drivers/i915/i915_resource_texture.c b/src/gallium/drivers/i915/i915_resource_texture.c
index 9a3279ccb75..03cdcf1c990 100644
--- a/src/gallium/drivers/i915/i915_resource_texture.c
+++ b/src/gallium/drivers/i915/i915_resource_texture.c
@@ -728,7 +728,7 @@ i915_texture_transfer_map(struct pipe_context *pipe,
    unsigned offset;
    char *map;
 
-   if (transfer == NULL)
+   if (!transfer)
       return NULL;
 
    transfer->b.resource = resource;
@@ -774,7 +774,7 @@ i915_texture_transfer_map(struct pipe_context *pipe,
 
    map = iws->buffer_map(iws, tex->buffer,
                          (transfer->b.usage & PIPE_TRANSFER_WRITE) ? TRUE : FALSE);
-   if (map == NULL) {
+   if (!map) {
       pipe_resource_reference(&transfer->staging_texture, NULL);
       FREE(transfer);
       return NULL;