Since arg[0] will be NULL without any argument here and starts_with()
does not like NULL-pointers.

Signed-off-by: Heiko Voigt <hvo...@hvoigt.net>
---
A small fix I found while developing the test.

 test-submodule-config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test-submodule-config.c b/test-submodule-config.c
index dab8c27..a4e4098 100644
--- a/test-submodule-config.c
+++ b/test-submodule-config.c
@@ -23,7 +23,7 @@ int main(int argc, char **argv)
 
        arg++;
        my_argc--;
-       while (starts_with(arg[0], "--")) {
+       while (arg[0] && starts_with(arg[0], "--")) {
                if (!strcmp(arg[0], "--url"))
                        output_url = 1;
                if (!strcmp(arg[0], "--name"))
-- 
2.0.2.832.g083c931

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