qcacmn: Fix the build failure of illegal usage of log

In function target_if_direct_buf_rx_register_events(), the
API direct_buf_rx_info() is used to record log, but the
format is wrong. Fix the log format.

Change-Id: I81bc128e110570d96ca95dfbe773121272eb2588
CRs-Fixed: 2547235

target_if/direct_buf_rx/src/target_if_direct_buf_rx_main.c

@@ -1218,7 +1218,7 @@ QDF_STATUS target_if_direct_buf_rx_register_events(
 			WMI_RX_UMAC_CTX);
 
 	if (ret)
-		direct_buf_rx_info("event handler not supported", ret);
+		direct_buf_rx_info("event handler not supported, ret=%d", ret);
 
 	return QDF_STATUS_SUCCESS;
 }