checkpatch: only report error on hit

The Linux checkpatch script used by OpenOCD reports hits either as
error, warning and check.
Such classification is meaningful for Linux maintainers, but for
OpenOCD Jenkins they are all considered as errors.

Having such classification in the checkpatch report by Jenkins is
misleading for developers that expect 'warnings' to be probably
ignored by maintainers, while having no idea what 'checks' means.

This patch flattens all the checkpatch reports to 'error' only.

Checkpatch can trigger false positives. OpenOCD uses the tag
	Checkpatch-ignore:
in the commit message to prevent Jenkins to report the error, as
described in HACKING.

Change-Id: I1d3164ba1f725c0763dfe362192ffa669b3856e6
Signed-off-by: Antonio Borneo <[email protected]>
Reviewed-on: https://review.openocd.org/c/openocd/+/8424
Reviewed-by: Karl Palsson <[email protected]>
Tested-by: jenkins

tools/scripts/checkpatch.pl

@@ -2384,6 +2384,10 @@ sub show_type {
 sub report {
 	my ($level, $type, $msg) = @_;
 
+	# OpenOCD specific: Begin: Flatten ERROR, WARNING and CHECK as ERROR
+	$level = 'ERROR';
+	# OpenOCD specific: End
+
 	if (!show_type($type) ||
 	    (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
 		return 0;
@@ -7638,9 +7642,15 @@ sub process {
 	print report_dump();
 	if ($summary && !($clean == 1 && $quiet == 1)) {
 		print "$filename " if ($summary_file);
+		if (!$OpenOCD) {
 		print "total: $cnt_error errors, $cnt_warn warnings, " .
 			(($check)? "$cnt_chk checks, " : "") .
 			"$cnt_lines lines checked\n";
+		} # $OpenOCD
+		# OpenOCD specific: Begin: Report total as errors
+		my $total = $cnt_error + $cnt_warn + $cnt_chk;
+		print "total: $total errors, $cnt_lines lines checked\n";
+		# OpenOCD specific: End
 	}
 
 	if ($quiet == 0) {