test get_git_work_tree() return value for NULL
If we are in a git directory, get_git_work_tree() can return NULL. While trying to determine whether or not the given paths are outside the work tree, the following command would read from it anyways and trigger a segmentation fault. git diff / / Signed-off-by: NClemens Buchacher <drizzd@aon.at> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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