checkpatch: quiet Kconfig help message checking

Editing Kconfig dependencies can emit unnecessary messages about missing
or too short help entries.

Only emit the message when adding help sections to Kconfig files.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2052,7 +2052,7 @@ sub process {
 # Only applies when adding the entry originally, after that we do not have
 # sufficient context to determine whether it is indeed long enough.
 		if ($realfile =~ /Kconfig/ &&
-		    $line =~ /.\s*config\s+/) {
+		    $line =~ /^\+\s*config\s+/) {
 			my $length = 0;
 			my $cnt = $realcnt;
 			my $ln = $linenr + 1;
@@ -2065,10 +2065,11 @@ sub process {
 				$is_end = $lines[$ln - 1] =~ /^\+/;
 
 				next if ($f =~ /^-/);
+				last if (!$file && $f =~ /^\@\@/);
 
-				if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) {
+				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) {
 					$is_start = 1;
-				} elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) {
+				} elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) {
 					$length = -1;
 				}