Don't panic even if bus_dmamap_load(9) was failed. Just return ENOBUFS so callers can reuse previous mbuf.
Don't panic even if bus_dmamap_load(9) was failed. Just return
ENOBUFS so callers can reuse previous mbuf.

Submitted by:	Oleg  (agile.quad AT gmail DOT com)
MFC after:	1 week

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