Sepherosa Ziehau 39f0182303 hyperv/storvsc: The max channel in PDU actually means the max sub-chans.
Use proper name for local variables. PDU fields' name was not changed yet.
While I'm here, make # of usable channels tunable. This eases further
testing.

MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8851
2016-12-21 03:09:07 +00:00
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