submodule: add a helper to check if it is safe to write to .gitmodules

diff --git a/builtin/check-attr.c b/builtin/check-attr.c
index f7b59993d3a10952921204bbaaf4d4bf349191c5..c05573ff9cd091cbe3b5ff1980fa7fb4815f6ebd 100644 (file)
--- a/builtin/check-attr.c
+++ b/builtin/check-attr.c
@@ -120,7 +120,7 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
        }
 
        if (cached_attrs)
-               git_attr_set_direction(GIT_ATTR_INDEX, NULL);
+               git_attr_set_direction(GIT_ATTR_INDEX);
 
        doubledash = -1;
        for (i = 0; doubledash < 0 && i < argc; i++) {