sbruno 6a3325bc68 Correct possible underflow conditions when checking for available space
in the tx h/w ring buffer.

Reviewed by:	gnn jeb.j.cramer@intel.com
MFC after:	1 week
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D5918
2016-04-18 20:33:44 +00:00
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