dir: exit before wildcard fall-through if there is no wildcard

The DO_MATCH_LEADING_PATHSPEC had a fall-through case for if there was a
wildcard, noting that we don't yet have enough information to determine
if a further paths under the current directory might match due to the
presence of wildcards.  But if we have no wildcards in our pathspec,
then we shouldn't get to that fall-through case.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

dir.c

@@ -379,6 +379,13 @@ static int match_pathspec_item(const struct index_state *istate,
 			       item->nowildcard_len - prefix))
 			return 0;
 
+		/*
+		 * name has no wildcard, and it didn't match as a leading
+		 * pathspec so return.
+		 */
+		if (item->nowildcard_len == item->len)
+			return 0;
+
 		/*
 		 * Here is where we would perform a wildmatch to check if
 		 * "name" can be matched as a directory (or a prefix) against