introduce CHECKOUT_INIT

Add a static initializer for struct checkout and use it throughout the
code base.  It's shorter, avoids a memset(3) call and makes sure the
base_dir member is initialized to a valid (empty) string.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/unpack-trees.c b/unpack-trees.c
index 3db3f02577..ea6bdd20e0 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1094,12 +1094,10 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 	int i, ret;
 	static struct cache_entry *dfc;
 	struct exclude_list el;
-	struct checkout state;
+	struct checkout state = CHECKOUT_INIT;
 
 	if (len > MAX_UNPACK_TREES)
 		die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES);
-	memset(&state, 0, sizeof(state));
-	state.base_dir = "";
 	state.force = 1;
 	state.quiet = 1;
 	state.refresh_cache = 1;