i915: Fix GCC unused-but-set-variable warning in release build.

i915_fragprog.c: In function ‘i915ValidateFragmentProgram’:
i915_fragprog.c:1453:11: warning: variable ‘k’ set but not used [-Wunused-but-set-variable]
       int k;
           ^

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
1 file changed