Don't use empty structure initializers.

Empty initializers for structures are not allowed in ANSI C99. This patch
removes such an initializer from `builtin-read-tree.c'. Since the struct was
static (and is therefore implicitely initialized to zero anyway) it wasn't
actually needed.

Signed-off-by: Florian Forster <octo@verplant.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-read-tree.c

@@ -31,8 +31,7 @@ static int merge_size = 0;
 
 static struct object_list *trees = NULL;
 
-static struct cache_entry df_conflict_entry = {
-};
+static struct cache_entry df_conflict_entry;
 
 struct tree_entry_list {
 	struct tree_entry_list *next;