cache_tree_find(): remove early return

There is no need for an early

    return it;

from the loop if slash points at the end of the string, because that
is exactly what will happen when the while condition fails at the
start of the next iteration.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache-tree.c

@@ -565,8 +565,6 @@ static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *pat
 		it = sub->cache_tree;
 		while (*slash == '/')
 			slash++;
-		if (!*slash)
-			return it; /* prefix ended with slashes */
 		path = slash;
 	}
 	return it;