Fix an alignment panic my preserving the 2byte padding (ETHER_ALIGN) on our copied mbuf, which keeps the IP header 32-bit aligned. This copied mbuf is reinjected back into ether_input and off to the IP routines.
Fix an alignment panic my preserving the 2byte padding (ETHER_ALIGN) on our
copied mbuf, which keeps the IP header 32-bit aligned. This copied mbuf is
reinjected back into ether_input and off to the IP routines.

Reported and tested by:	Peter van Dijk
Approved by:		mlaier (mentor)
MFC after:		3 days

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