util/lint/checkpatch: Decrease commit message line length limit to 72

Currently, `checkpatch.pl`, imported from the Linux project, checks for
75 characters per line [2]:

> Suggest line wrapping at 75 columns so the default git commit log
> indentation of 4 plus the commit message text still fits on an 80
> column screen.

But Gerrit’s Web interface and its commit hooks use with 72 characters
per line [2]:

    remote: commit 35bb56d: warning: too many message lines longer than 72 characters; manually wrap lines
    remote:
    remote: SUCCESS
    remote:
    remote:   https://review.coreboot.org/c/coreboot/+/60004 [DO NOT SUBMIT] Gerrit commit msg line length test [NEW]

So, decrease the suggested length from 75 to 72 characters per line.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a076f40d8c9be95bee7bcf18436655e1140447f
[2]: https://review.coreboot.org/60004

Change-Id: Ic9c686cb1a902259b18377b76b5c999e94660fed
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60006
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
GitOrigin-RevId: dd1ee27503a7d21899bf50fa58cdd16bbab83633
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/+/3331541
Tested-by: Copybara Service <copybara-worker-blackhole@google.com>
Reviewed-by: Dossym Nurmukhanov <dossym@chromium.org>
Commit-Queue: Andrew McRae <amcrae@google.com>
diff --git a/util/lint/checkpatch.pl b/util/lint/checkpatch.pl
index f1c31c5..41aae93 100755
--- a/util/lint/checkpatch.pl
+++ b/util/lint/checkpatch.pl
@@ -2655,9 +2655,9 @@
 			$commit_log_possible_stack_dump = 1;
 		}
 
-# Check for line lengths > 75 in commit log, warn once
+# Check for line lengths > 72 in commit log, warn once
 		if ($in_commit_log && !$commit_log_long_line &&
-		    length($line) > 75 &&
+		    length($line) > 72 &&
 		    !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
 					# file delta changes
 		      $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
@@ -2666,7 +2666,7 @@
 					# A Fixes: or Link: line
 		      $commit_log_possible_stack_dump)) {
 			WARN("COMMIT_LOG_LONG_LINE",
-			     "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr);
+			     "Possible unwrapped commit description (prefer a maximum 72 chars per line)\n" . $herecurr);
 			$commit_log_long_line = 1;
 		}