checkpatch: fine tune checks

Fine tune the following two checks:

- Check for incorrect file permissions
  This one had a linux path hard coded, so it would choke on
  some commits unnecessarily.
- FILE_PATH_CHANGES seems to not be working correctly. It will
  choke on added / deleted files even if the MAINTAINERS file
  is touched. Hence, switch from WARN to CHK (as WARN currently
  blocks commits as well)

Change-Id: I9fccfbd75e94f420de45cf8b58071e3198065cf3
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10123
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/lint/checkpatch.pl

@@ -2069,7 +2069,8 @@ sub process {
 # Check for incorrect file permissions
 		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
 			my $permhere = $here . "FILE: $realfile\n";
-			if ($realfile !~ m@scripts/@ &&
+			if ($realfile !~ m@util/lint/@ &&
+			    $realfile !~ m@util/scripts/@ &&
 			    $realfile !~ /\.(py|pl|awk|sh)$/) {
 				ERROR("EXECUTE_PERMISSIONS",
 				      "do not set execute permissions for source files\n" . $permhere);
@@ -2194,7 +2195,7 @@ sub process {
 		     ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
 		      (defined($1) || defined($2))))) {
 			$reported_maintainer_file = 1;
-			WARN("FILE_PATH_CHANGES",
+			CHK("FILE_PATH_CHANGES",
 			     "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
 		}