[PATCH] checkpatch: Avoid NOT_UNIFIED_DIFF errors on cover-letter.patch files

[Joe Perches]

Make an exception for the "Does not appear to be a unified-diff"
error when scanning what appears to be git generated cover letters.

Suggested-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Joe Perches <joe@xxxxxxxxxxx>
---
 scripts/checkpatch.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c8032a0..da417b6 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5563,7 +5563,7 @@ sub process {
 		exit(0);
 	}
 
-	if (!$is_patch) {
+	if (!$is_patch && $file !~ /cover-letter\.patch$/) {
 		ERROR("NOT_UNIFIED_DIFF",
 		      "Does not appear to be a unified-diff format patch\n");
 	}


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