mesa-hostmot2 driver:  Remove int->double conversions

Fixes 'Unknown symbol __fixunsdfdi' on 32-bit gcc-4.[34].x kthreads

Also see:

http://permalink.gmane.org/gmane.linux.distributions.emc.user/18718
http://permalink.gmane.org/gmane.linux.distributions.emc.devel/3663

(Several more in components/lcd.c parse_fmt() that'll be harder/uglier
to squash)