MP3 GRP1 tag returned with leading null

[darrell-k]

I worked around this with this code in Slim::Formats::MP3 -

	my $s = Audio::Scan->scan( $file );

	if ( exists $s->{tags}->{GRP1} ) {
		$s->{tags}->{GRP1} =~ s/\x0//g; # scanner is returning leading null in GRP1 tag, which messes things up.
	}