fix stupid syntax error!

can be catched with trival compile only run:

$ perl -c check_mailq.pl
syntax error at check_mailq.pl line 40, near ")

sub print_help ()"
check_mailq.pl had compilation errors.

plugins-scripts/check_mailq.pl

@@ -36,7 +36,7 @@ use lib "$FindBin::Bin";
 use lib '@libexecdir@';
 use utils qw(%ERRORS &print_revision &support &usage );
 
-my ($sudo)
+my ($sudo);
 
 sub print_help ();
 sub print_usage ();