If IF_HANDOFF() or netisr_queue() fail, they will free the mbuf.  When this happens, set (m) to NULL or we'll try to free it a second time on return.
If IF_HANDOFF() or netisr_queue() fail, they will free the mbuf.  When
this happens, set (m) to NULL or we'll try to free it a second time on
return.

Submitted by:	Pavel Gulchouck <gul@gul.kiev.ua>

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