Fixed dcb_write failing when the cause was EAGAIN or EWOULDBLOCK.

server/modules/routing/readwritesplit/readwritesplit.c

@@ -2493,8 +2493,8 @@ static bool route_single_stmt(
 			rses_end_locked_router_action(rses);
 			goto retblock;
 		}
-		
-		if ((ret = target_dcb->func.write(target_dcb, gwbuf_clone(querybuf))) == 1)
+		GWBUF* wbuf = gwbuf_clone(querybuf);
+		if ((ret = target_dcb->func.write(target_dcb, wbuf)) == 1)
 		{
 			backend_ref_t* bref;
 			
@@ -2508,7 +2508,8 @@ static bool route_single_stmt(
 		}
 		else
 		{
-			LOGIF(LE, (skygw_log_write_flush(
+		    gwbuf_free(wbuf);
+			LOGIF((LE|LT), (skygw_log_write_flush(
 				LOGFILE_ERROR,
 				"Error : Routing query failed.")));
 			succp = false;