remote: don't show success message when set-head fails

Suppress the message 'origin/HEAD set to master' in case of an error.

  $ git remote set-head origin -a
  error: Not a valid ref: refs/remotes/origin/master
  origin/HEAD set to master

Signed-off-by: Christian Schlack <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: cschlack

builtin/remote.c

@@ -1355,7 +1355,7 @@ static int set_head(int argc, const char **argv)
 			result |= error(_("Not a valid ref: %s"), buf2.buf);
 		else if (create_symref(buf.buf, buf2.buf, "remote set-head"))
 			result |= error(_("Could not setup %s"), buf.buf);
-		if (opt_a)
+		else if (opt_a)
 			printf("%s/HEAD set to %s\n", argv[0], head_name);
 		free(head_name);
 	}