glsl: Fix gl_shader_stage enum unsigned comparison

Replace -1 with MESA_SHADER_NONE enum value to fix sign related warning:

external/mesa3d/src/compiler/glsl/link_varyings.cpp:1415:25: warning: comparison of constant -1 with expression of type 'gl_shader_stage' is always true [-Wtautological-constant-out-of-range-compare]
        (consumer_stage != -1 && consumer_stage != MESA_SHADER_FRAGMENT))) {
         ~~~~~~~~~~~~~~ ^  ~~

Reviewed-by: Nicolai Hähnle <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index e451bda8016..e07e5f509b5 100644
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -3245,6 +3245,9 @@ apply_explicit_location(const struct ast_type_qualifier *qual,
                        "compute shader variables cannot be given "
                        "explicit locations");
       return;
+   default:
+      fail = true;
+      break;
    };
 
    if (fail) {
@@ -3276,7 +3279,7 @@ apply_explicit_location(const struct ast_type_qualifier *qual,
             ? (qual_location + FRAG_RESULT_DATA0)
             : (qual_location + VARYING_SLOT_VAR0);
          break;
-      case MESA_SHADER_COMPUTE:
+      default:
          assert(!"Unexpected shader type");
          break;
       }
@@ -4089,6 +4092,8 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
       case MESA_SHADER_COMPUTE:
          /* Invariance isn't meaningful in compute shaders. */
          break;
+      default:
+         break;
       }
    }