scripts/get_abi.pl: Ignore hidden files

get_abi.pl currently collects every file in Documentation/ABI. This
causes a UnicodeDecodeError in Documentation/sphinx/kernel_abi.py,
when it finds my Vim swap files (.foo.swp) in the directory.

To avoid such issues, ignore hidden files in get_abi.pl.

Reviewed-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Jonathan Neuschäfer <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

scripts/get_abi.pl

···
 	my $mode = (stat($file))[2];
 	return if ($mode & S_IFDIR);
 	return if ($file =~ m,/README,);
+	return if ($file =~ m,/\.,);
 
 	my $name = $file;
 	$name =~ s,.*/,,;