Revert "selinux: do not report error on connect(AF_UNSPEC)"

This reverts commit c7e0d6cc.

It was agreed a slightly different fix via the selinux tree.

v1 -> v2:
 - use the correct reverted commit hash

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>