Merge branch 'maint'

* maint:
  sample commit-msg hook: no silent exit on duplicate Signed-off-by lines
  Fix regex pattern in commit-msg

templates/hooks--commit-msg

@@ -11,4 +11,8 @@
 # This example catches duplicate Signed-off-by lines.
 
 test "" = "$(grep '^Signed-off-by: ' "$1" |
-	 sort | uniq -c | sed -e '/^[ 	]*1 /d')"
+	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
+	echo >&2 Duplicate Signed-off-by lines.
+	exit 1
+}
+