submodule_init: die cleanly on submodules without url defined
When we init a submodule, we try to die when it has no URL defined: url = xstrdup(sub->url); if (!url) die(...); But that's clearly nonsense. xstrdup() will never return NULL, and if sub->url is NULL, we'll segfault. These two bits of code need to be flipped, so we check sub->url before looking at it. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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