git add: trivial codestyle cleanup

Global static variables don't need to be initialized to 0/NULL.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-add.c

diff --git a/builtin-add.c b/builtin-add.c
index ac98c83..08443f2 100644
--- a/builtin-add.c
+++ b/builtin-add.c
@@ -15,7 +15,7 @@
 	"git add [options] [--] <filepattern>...",
 	NULL
 };
-static int patch_interactive = 0, add_interactive = 0;
+static int patch_interactive, add_interactive;
 static int take_worktree_changes;
 
 static void fill_pathspec_matches(const char **pathspec, char *seen, int specs)