[patch] e1000 / lem handling of TSO defragmentation

[Andrew Boyer]

Similar to what was done for em in r220254, this patch improves the error handling in lem when a TSO packet has too many segments to DMA.  This improves the behavior when either call to bus_dmamap_load_mbuf_sg() returns ENOMEM.  Although we don't need to go back and redo any offload calculation in lem, doing it this way reduces code duplication.

Comments welcome.

-Andrew

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Andrew Boyer	aboyer at averesystems.com