Make an exception for the "Does not appear to be a unified-diff" error
when scanning what appears to be git generated cover letters.
Signed-off-by: NJoe Perches <joe@perches.com>
Suggested-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>