This check was removed by accident, re-add it.  Also add a test for it.

Fixes: 0e77b3bcbfe2 ("ovn-northd-ddlog: New implementation of ovn-northd based 
on ddlog.")
Signed-off-by: Dumitru Ceara <[email protected]>
---
 tests/checkpatch.at     | 12 ++++++++++++
 utilities/checkpatch.py |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/tests/checkpatch.at b/tests/checkpatch.at
index 8f45beac9..0c724d3d6 100755
--- a/tests/checkpatch.at
+++ b/tests/checkpatch.at
@@ -329,3 +329,15 @@ try_checkpatch \
 "
 
 AT_CLEANUP
+
+AT_SETUP([checkpatch - line too long])
+try_checkpatch \
+   "COMMON_PATCH_HEADER
+    +/* This is a very long 
line.................................................. */
+    " \
+    "WARNING: Line is 80 characters long (recommended limit is 79)
+#8 FILE: A.c:1:
+/* This is a very long line.................................................. 
*/
+"
+
+AT_CLEANUP
diff --git a/utilities/checkpatch.py b/utilities/checkpatch.py
index af7bcfc29..9e8d17653 100755
--- a/utilities/checkpatch.py
+++ b/utilities/checkpatch.py
@@ -184,7 +184,7 @@ skip_signoff_check = False
 #
 # Python isn't checked as flake8 performs these checks during build.
 line_length_blacklist = re.compile(
-    r'\.(am|at|etc|in|m4|mk|patch|py|dl)|$|debian/rules')
+    r'\.(am|at|etc|in|m4|mk|patch|py|dl)$|debian/rules')
 
 # Don't enforce a requirement that leading whitespace be all spaces on
 # files that include these characters in their name, since these kinds
-- 
2.27.0

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