Fix setup_git_directory_gently() with relative GIT_DIR & GIT_WORK_TREE
There are a few programs, such as config and diff, which allow running without a git repository. Therefore, they have to call setup_git_directory_gently(). However, when GIT_DIR and GIT_WORK_TREE were set, and the current directory was a subdirectory of the work tree, setup_git_directory_gently() would return a bogus NULL prefix. This patch fixes that. Noticed by REPLeffect on IRC. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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