branch_get_push: do not segfault when HEAD is detached
Move the detached HEAD check from branch_get_push_1() to branch_get_push() to avoid setting branch->push_tracking_ref when branch is NULL. Signed-off-by: NKyle Meyer <kyle@kyleam.com> Reviewed-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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