drm/amdgpu: fix hpd range check in dce_v8_0_hpd_irq()
drm/amdgpu: fix hpd range check in dce_v8_0_hpd_irq()

Spotted by Dan Carpenter.  This is a slight variant of
his fix.

Signed-off-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs