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Description:  qeth: fix L3 next-hop im xmit qeth hdr

Symptom:      wrong destination address in qdio header

Problem:      The current code accesses rtable->rt_gateway without checking
              that rtable is a valid address. The accidental access to a
              lowcore area results in a random next-hop address in the
              qeth_hdr.
              rtable (or more precisely, skb_dst(skb)) can be NULL in rare
              cases (for instance together with AF_PACKET sockets).

Solution:     Add the missing NULL-ptr checks.
Reproduction: AF_PACKET program sending raw data


Upstream Commit:
ec2c6726322f0d270bab477e4904bf9496f70ee5
kernel 4.13

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-164873 severity-high 
targetmilestone-inin1804
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qeth: fix L3 next-hop im xmit qeth hdr
https://bugs.launchpad.net/bugs/1750813
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