ref-filter: die on parse_commit errors

The tag-contains algorithm quietly returns "does not
contain" when parse_commit() fails. But a parse failure is
an indication that the repository is corrupt. We should die
loudly rather than producing a bogus result.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/ref-filter.c b/ref-filter.c
index 631978a..5cb49b7 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1523,9 +1523,7 @@
 		return CONTAINS_YES;
 	}
 
-	if (parse_commit(candidate) < 0)
-		return CONTAINS_NO;
-
+	parse_commit_or_die(candidate);
 	return CONTAINS_UNKNOWN;
 }