[Midnightbsd-cvs] src: drm_irq.c: use atomic_store rather than set

[laffer1 at midnightbsd.org]

Log Message:
-----------
use atomic_store rather than set

Modified Files:
--------------
    src/sys/dev/drm:
        drm_irq.c (r1.5 -> r1.6)
        (http://cvsweb.midnightbsd.org/src/sys/dev/drm/drm_irq.c?r1=1.5&r2=1.6)