merge: use help_unknown_ref()

Use help.c:help_unknown_ref() instead of die() to provide a
friendlier error message before exiting, when one of the refs
specified in a merge is unknown.

Signed-off-by: Vikrant Varma <vikrant.varma94@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/merge.c b/builtin/merge.c
index 3e2daa37c367560450217cfae5cbb717bfb508af..2ebe732896c1b3bfd920941b5182b793468c0afe 100644 (file)
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1054,7 +1054,8 @@ static struct commit_list *collect_parents(struct commit *head_commit,
        for (i = 0; i < argc; i++) {
                struct commit *commit = get_merge_parent(argv[i]);
                if (!commit)
-                       die(_("%s - not something we can merge"), argv[i]);
+                       help_unknown_ref(argv[i], "merge",
+                                        "not something we can merge");
                remotes = &commit_list_insert(commit, remotes)->next;
        }
        *remotes = NULL;