get_results_p: remove superfluous cache_str variable

	my ( $station, %opt ) = @_;

	my $data;

	# Cache::File has UTF-8 problems, so strip it (and any other potentially

	# problematic chars).

	my $cache_str = $station;

	$cache_str =~ tr{[0-9a-zA-Z -]}{}cd;

	if ( $ENV{DBFAKEDISPLAY_STATS} ) {

		log_api_access();

	}