String re bugfix

This bug is associated with the `hp-setup` python script in the hplip project (installed on my Arch Linux machine as /usr/bin/hp-setup). In line 560, you match a regular expression against a variable called "nickname":

desc = nickname_pat.search(nickname).group(1)

However, "nickname" is not a string but rather a bytes object (this is the standard result of calling `read()`). It ought to be decoded. This will fix the issue:

nickname = nickname.decode('utf-8')
desc = nickname_pat.search(nickname).group(1)