In version 6.8.99.902 the mouse-wheel on the device sysmouse does not work

[Andrew Muhametshin]

In version 6.8.99.902, if the device "/dev/sysmouse" is used - that does not
work mouse-scroll.
On 6.8.2 / 6.8.99.16 - works, but after a upgrade up to 6.8.99.902 - not 
work.

Mouse - Logitech MX-300
moused_flags="-F 200 -r high -z 4 5 -a 1 -w 6 -l 1"
FreeBSD-6

https://bugs.freedesktop.org/show_bug.cgi?id=5224