tc: fflush after each command in batch mode

Restore behaviour of tc batch mode.
Flush stdout after each command.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

tc/tc.c

@@ -270,6 +270,7 @@ static int batch(const char *name)
 			if (!force)
 				break;
 		}
+		fflush(stdout);
 	}
 
 	free(line);