Merge branch 'udp-hdrs-fixes'

Willem de Bruijn says:

====================
fix two more udp pull header issues

Follow up patches to the fixes to RxRPC and SunRPC. A scan of the
code showed two other interfaces that expect UDP packets to have
a udphdr when queued: read packet length with ioctl SIOCINQ and
receive payload checksum with socket option IP_CHECKSUM.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>