refs.c: refer to "object ID", not "sha1", in error messages

We have two error messages that complain about the "sha1". Because we
are about to touch one of these sites and add some tests, let's first
modernize the messages to say "object ID" instead.

While at it, make the second one use `error()` instead of `warning()`.
After printing the message, we do not continue, but actually drop the
lock and return -1 without deleting the pseudoref.

Signed-off-by: Martin Ågren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Martin Ågren

refs.c

@@ -684,7 +684,8 @@ static int write_pseudoref(const char *pseudoref, const struct object_id *oid,
 		if (read_ref(pseudoref, &actual_old_oid))
 			die("could not read ref '%s'", pseudoref);
 		if (oidcmp(&actual_old_oid, old_oid)) {
-			strbuf_addf(err, "unexpected sha1 when writing '%s'", pseudoref);
+			strbuf_addf(err, "unexpected object ID when writing '%s'",
+				    pseudoref);
 			rollback_lock_file(&lock);
 			goto done;
 		}
@@ -722,7 +723,8 @@ static int delete_pseudoref(const char *pseudoref, const struct object_id *old_o
 		if (read_ref(pseudoref, &actual_old_oid))
 			die("could not read ref '%s'", pseudoref);
 		if (oidcmp(&actual_old_oid, old_oid)) {
-			warning("Unexpected sha1 when deleting %s", pseudoref);
+			error("unexpected object ID when deleting '%s'",
+			      pseudoref);
 			rollback_lock_file(&lock);
 			return -1;
 		}