grehan 2e1b5200e9 Bring the handling of the y axis in the ums driver in-line with the other
axes.

No functional change.

Submitted by:	Vicki Pfau (vi AT endrift.com)
Approved by:	hps
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D9595
2017-03-22 17:06:57 +00:00
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