John Baldwin 4d805eacfa Tidy up the unmapped I/O code in qphysio.
- Move some blocks around to reduce the number of 'if (unmap)' checks.
- Use 'pbuf == NULL' instead of 'unmap'.
- Use nitems.
- Pull an assignment out of an if expression.

Reviewed by:	kib
Sponsored by:	Chelsio Communications
2016-03-31 17:27:30 +00:00
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