reflog: improve error for when reflog is not found

The 'git reflog expire' prints the error message '<ref> points nowhere!'
when used with a non-existent ref. This message is a bit confusing and
vague. Modify the message to be more clear and direct.

Signed-off-by: Karthik Nayak <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: KarthikNayak

builtin/reflog.c

@@ -383,7 +383,7 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix,
 		struct expire_reflog_policy_cb cb = { .cmd = cmd };
 
 		if (!repo_dwim_log(the_repository, argv[i], strlen(argv[i]), NULL, &ref)) {
-			status |= error(_("%s points nowhere!"), argv[i]);
+			status |= error(_("reflog could not be found: '%s'"), argv[i]);
 			continue;
 		}
 		set_reflog_expiry_param(&cb.cmd, ref);

t/t1410-reflog.sh

@@ -315,9 +315,9 @@ test_expect_success 'git reflog expire unknown reference' '
 	test_config gc.reflogexpireunreachable never &&
 
 	test_must_fail git reflog expire main@{123} 2>stderr &&
-	test_grep "points nowhere" stderr &&
+	test_grep "error: reflog could not be found: ${SQ}main@{123}${SQ}" stderr &&
 	test_must_fail git reflog expire does-not-exist 2>stderr &&
-	test_grep "points nowhere" stderr
+	test_grep "error: reflog could not be found: ${SQ}does-not-exist${SQ}" stderr
 '
 
 test_expect_success 'checkout should not delete log for packed ref' '