checkpatch: fix ignoring cover-letter logic

Currently running checkpatch on a directory with a cover-letter.patch
file reports the following error:

  -----------------------------------------
  patches/smp-v2/v2-0000-cover-letter.patch
  -----------------------------------------

  ERROR: Does not appear to be a unified-diff format patch

The logic to suppress the unified-diff check for cover letters is there
but is checking $file instead of $filename.  Fix the variable to use the
correct one.

Link: http://lkml.kernel.org/r/20170909090406.31523-1-shorne@gmail.com
Signed-off-by: Stafford Horne <shorne@gmail.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index dd2c262aebbf2a43283f38badcf445702c59c9e9..8b80bac055e490219f97d913f33bce165960fe92 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6390,7 +6390,7 @@ sub process {
                exit(0);
        }
 
-       if (!$is_patch && $file !~ /cover-letter\.patch$/) {
+       if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
                ERROR("NOT_UNIFIED_DIFF",
                      "Does not appear to be a unified-diff format patch\n");
        }