drm/radeon/kms: fix potential segfault in r600_ioctl_wait_idle
radeon_gem_wait_idle_ioctl can apparently get called prior to the vram page being set up or even if accel if false, so make sure it's valid before using it. Should fix: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=597636 https://bugs.freedesktop.org/show_bug.cgi?id=29834Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Cc: stable@kernel.org Signed-off-by: Dave Airlie <airlied@redhat.com>
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