Minor style rewrite for crypt.c

[Héctor Luis Gimbatti]

Greetings,
The function crypt (/usr/src/lib/libc/crypt/crypt.c) might be rewritten as:

char *
crypt(const char *key, const char *setting)
{
        if (setting[0] == '$' && setting[1] == '2')
                return bcrypt(key, setting);
        errno = EINVAL;
        return (NULL);

}


--- HLG