drm/i915/guc: Check if expecting reply before decrementing outstanding_submission_g2h

From Jesus Narvaez
2679bb2f692e3d9b6c20863ba0fd8a793ea24f16 in linux-6.12.y/6.12.34
c557fd1050f6691dde36818dfc1a4c415c42901b in mainline linux

Author: jonathangray

sys/dev/pci/drm/i915/gt/uc/intel_guc_submission.c

@@ -633,7 +633,7 @@ static int guc_submission_send_busy_loop(struct intel_guc *guc,
 		atomic_inc(&guc->outstanding_submission_g2h);
 
 	ret = intel_guc_send_busy_loop(guc, action, len, g2h_len_dw, loop);
-	if (ret)
+	if (ret && g2h_len_dw)
 		atomic_dec(&guc->outstanding_submission_g2h);
 
 	return ret;