intel: fix -Wmaybe-uninitialized warnings
diff --git a/icd/intel/layout.h b/icd/intel/layout.h
index fc86155..4fc8517 100644
--- a/icd/intel/layout.h
+++ b/icd/intel/layout.h
@@ -284,6 +284,8 @@
       }
    default:
       assert(!"unknown layout walk type");
+      *x = 0;
+      *y = 0;
       break;
    }