reset: avoid redundant error message

If writing or committing the new index file fails, we print "Could not
write new index file." followed by "Could not reset index file to
revision $rev.". The first message seems to imply the second, so print
only the first message.

Signed-off-by: Martin von Zweigbergk <martinvonz@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/reset.c

@@ -338,13 +338,11 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 		int err = reset_index(sha1, reset_type, quiet);
 		if (reset_type == KEEP && !err)
 			err = reset_index(sha1, MIXED, quiet);
-		if (!err &&
-		    (write_cache(newfd, active_cache, active_nr) ||
-		     commit_locked_index(lock))) {
-			err = error(_("Could not write new index file."));
-		}
 		if (err)
 			die(_("Could not reset index file to revision '%s'."), rev);
+		if (write_cache(newfd, active_cache, active_nr) ||
+		    commit_locked_index(lock))
+			die(_("Could not write new index file."));
 	}
 
 	/* Any resets update HEAD to the head being switched to,