scripts: get_abi.pl: Ignore fs/cgroup sysfs nodes earlier

In order to speedup the parser and store less data, handle
fs/cgroup exceptions a lot earlier.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/caa37831c9e02ae58677d1515ed7cee94f52ea9d.1631957565.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -550,6 +550,10 @@ my @files;
 my $escape_symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x29\x2b-\x2d\x3a-\x40\x7b-\xfe]) }x;
 sub parse_existing_sysfs {
 	my $file = $File::Find::name;
+
+	# Ignore cgroup and firmware
+	return if ($file =~ m#^/sys/(fs/cgroup|firmware)/#);
+
 	my $mode = (lstat($file))[2];
 	my $abs_file = abs_path($file);
 
@@ -570,9 +574,6 @@ sub parse_existing_sysfs {
 sub check_undefined_symbols {
 	foreach my $file (sort @files) {
 
-		# Ignore cgroup and firmware
-		next if ($file =~ m#^/sys/(fs/cgroup|firmware)/#);
-
 		my $defined = 0;
 		my $exact = 0;
 		my $whats = "";