peel_ref: do not return a null sha1

diff --git a/commit.c b/commit.c
index 8248a994a50ab91874600567e544aa3735e4aa98..42af4c1f238b96eeb9e88b227b6f6c10ef317058 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -68,7 +68,7 @@ struct commit *lookup_commit_reference_by_name(const char *name)
        unsigned char sha1[20];
        struct commit *commit;
 
-       if (get_sha1(name, sha1))
+       if (get_sha1_committish(name, sha1))
                return NULL;
        commit = lookup_commit_reference(sha1);
        if (!commit || parse_commit(commit))