cache-tree.c::cache_tree_find(): simplify internal API

Earlier cache_tree_find() needs to be called with a valid cache_tree,
but repeated look-up may find an invalid or missing cache_tree in between.
Help simplify the callers by returning NULL to mean "nothing appropriate
found" when the input is NULL.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache-tree.c b/cache-tree.c
index 6dd8411945c77568373e8a354b925926952f147c..5481e43340a1590f759cfacc954f4331216d67b5 100644 (file)
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -514,6 +514,8 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
 
 static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
 {
+       if (!it)
+               return NULL;
        while (*path) {
                const char *slash;
                struct cache_tree_sub *sub;