mesa: Fix _mesa_lookup_parameter_constant's return value.
Fixes gcc warning
In function ‘_mesa_add_unnamed_constant’:
warning: ‘pos’ may be used uninitialized in this function
but also what appears to be a bug.
diff --git a/src/mesa/program/prog_parameter.c b/src/mesa/program/prog_parameter.c
index 40dc92c..6bf8a08 100644
--- a/src/mesa/program/prog_parameter.c
+++ b/src/mesa/program/prog_parameter.c
@@ -482,8 +482,10 @@
assert(vSize >= 1);
assert(vSize <= 4);
- if (!list)
- return -1;
+ if (!list) {
+ *posOut = -1;
+ return GL_FALSE;
+ }
for (i = 0; i < list->NumParameters; i++) {
if (list->Parameters[i].Type == PROGRAM_CONSTANT) {