r600/compute: Free compiled kernels when deleting compute state

v2: Remove unnecessary null pointer check

CC: "10.0" <mesa-stable@lists.freedesktop.org>

src/gallium/drivers/r600/evergreen_compute.c

@@ -238,6 +238,8 @@ void evergreen_delete_compute_state(struct pipe_context *ctx, void* state)
 	if (!shader)
 		return;
 
+	FREE(shader->kernels);
+
 #ifdef HAVE_OPENCL
 	if (shader->llvm_ctx){
 		LLVMContextDispose(shader->llvm_ctx);