fix for a coredump

client/mysql.cc

@@ -340,6 +340,7 @@ int main(int argc,char *argv[])
   if (!status.batch)
     ignore_errors=1;				// Don't abort monitor
   signal(SIGINT, mysql_end);			// Catch SIGINT to clean up
+  signal(SIGQUIT, mysql_end);			// Catch SIGQUIT to clean up
 
   /*
   **  Run in interactive mode like the ingres/postgres monitor