clover: Fix up NULL constant pointer arguments.

Tested-by: Tom Stellard <thomas.stellard@amd.com>

diff --git a/src/gallium/state_trackers/clover/core/kernel.cpp b/src/gallium/state_trackers/clover/core/kernel.cpp
index 6d894cd..fa9453b 100644 (file)
--- a/src/gallium/state_trackers/clover/core/kernel.cpp
+++ b/src/gallium/state_trackers/clover/core/kernel.cpp
@@ -411,7 +411,8 @@ kernel::constant_argument::bind(exec_context &ctx,
 
 void
 kernel::constant_argument::unbind(exec_context &ctx) {
-   buf->resource(*ctx.q).unbind_surface(*ctx.q, st);
+   if (buf)
+      buf->resource(*ctx.q).unbind_surface(*ctx.q, st);
 }
 
 void