cifs: match even the scope id for ipv6 addresses

match_address function matches the scope id for ipv6 addresses,
but cifs_match_ipaddr (which is another function used for comparison)
does not use scope id. Doing so with this change.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>