Merge branch 'mptcp-a-couple-of-fixes'

Paolo Abeni says:

====================
mptcp: a couple of fixes

This series includes two related fixes addressing potential divide by 0
bugs in the MPTCP datapath.
====================

Link: https://lore.kernel.org/r/cover.1610471474.git.pabeni@redhat.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>