From 7e51f1979237e01bcd4e04e434c5da79151f08f8 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Wed, 11 Sep 2013 14:23:57 -0700
Subject: [PATCH] checkpatch: check for duplicate signatures

Emit a warning when a signature is used more than once.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Reading git-format-patch failed