checkpatch: allow not using -f with files that are in git
If a file exists in git and checkpatch is used without the -f flag for scanning a file, then checkpatch will scan the file assuming it's a patch and emit: ERROR: Does not appear to be a unified-diff format patch Change the behavior to assume the -f flag if the file exists in git. [joe@perches.com: fix git "fatal" warning if file argument outside kernel tree] Link: https://lkml.kernel.org/r/b6afa04112d450c2fc120a308d706acd60cee294.camel@perches.comSigned-off-by: NJoe Perches <joe@perches.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Reviewed-by: NJulia Lawall <julia.lawall@inria.fr> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lkml.kernel.org/r/45b81a48e1568bd0126a96f5046eb7aaae9b83c9.camel@perches.comSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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