Pull up following revision(s) (requested by msaitoh in ticket #677):

sys/external/bsd/drm2/dist/drm/radeon/radeon_uvd_v2_2.c: revision 1.2
sys/external/bsd/drm2/dist/drm/i915/intel_pm.c: revision 1.18
sys/external/bsd/drm2/dist/drm/radeon/nid.h: revision 1.3
sys/external/bsd/drm2/dist/drm/i915/intel_pm.c: revision 1.19
sys/external/bsd/drm2/dist/drm/radeon/rv770d.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/cikd.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_uvd_v4_2.c: revision 1.2
sys/external/bsd/drm2/dist/include/drm/drm_fixed.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/sumod.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_reg.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_mode.h: revision 1.5
sys/external/bsd/drm2/dist/drm/radeon/r600d.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/r600d.h: revision 1.4
sys/external/bsd/drm2/dist/drm/radeon/radeon_uvd_v1_0.c: revision 1.2
sys/external/bsd/drm2/dist/drm/radeon/radeon_uvd_v1_0.c: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_r600.c: revision 1.2
sys/external/bsd/drm2/dist/drm/radeon/evergreend.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/evergreend.h: revision 1.4
sys/external/bsd/drm2/dist/drm/i915/i915_reg.h: revision 1.10
sys/external/bsd/drm2/dist/drm/i915/i915_reg.h: revision 1.8
sys/external/bsd/drm2/dist/drm/i915/i915_reg.h: revision 1.11
sys/external/bsd/drm2/dist/drm/i915/i915_reg.h: revision 1.13
sys/external/bsd/drm2/dist/drm/radeon/rv730d.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_rv770_smc.c: revision 1.2
sys/external/bsd/drm2/dist/drm/radeon/sid.h: revision 1.3
sys/external/bsd/drm2/dist/drm/radeon/radeon_si_smc.c: revision 1.2
sys/external/bsd/drm2/dist/drm/radeon/sid.h: revision 1.4

Use unsigned to avoid undefined behavior. Found by kUBSan.

(martin)