I don't quite follow what you're trying to do (wouldn't the content of $passc depend on the salt used to encrypt it?), but does adding these two chomps help?

print 'enter password hash file: ';
open(PASSC, <STDIN>) or die "cannot open password file: $!\n";
chomp( $passc = <PASSC> );

print 'enter wordlist: ';
open(PASSF, <STDIN>) or die "cannot open wordlist file: $!\n";
chomp( @list = <PASSF> );
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