aufs: gen-patch: Fix Subject generation to skip SPDX-License-Identifier

debian/changelog

@@ -1,9 +1,13 @@
 linux (4.15.4-2) UNRELEASED; urgency=medium
 
+  [ Salvatore Bonaccorso ]
   * Add ABI reference for 4.15.0-1
   * ALSA: seq: Fix racy pool initializations (CVE-2018-7566)
   * sctp: verify size of a new chunk in _sctp_make_chunk() (CVE-2018-5803)
 
+  [ Ben Hutchings ]
+  * aufs: gen-patch: Fix Subject generation to skip SPDX-License-Identifier
+
  -- Salvatore Bonaccorso <carnil@debian.org>  Tue, 20 Feb 2018 21:51:39 +0100
 
 linux (4.15.4-1) unstable; urgency=medium

debian/patches/features/all/aufs4/gen-patch

@@ -20,7 +20,7 @@ for patch in aufs4-{base,mmap,standalone}.patch; do
 	    git log --pretty='Date: %ad' HEAD -1 -- "$patch"
 	fi
 	echo -n 'Subject: '
-	head -1 "$aufs_dir/$patch"
+	grep -v '^SPDX-License-Identifier:' "$aufs_dir/$patch" | head -1
 	echo "$origin_line"
 	echo "$bug_line"
 	echo