drm/amdgpu: fix VM size reporting on Raven

Raven doesn't have an VCE block and so also no buggy VCE firmware.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -619,7 +619,8 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		vm_size -= AMDGPU_VA_RESERVED_SIZE;
 
 		/* Older VCE FW versions are buggy and can handle only 40bits */
-		if (adev->vce.fw_version < AMDGPU_VCE_FW_53_45)
+		if (adev->vce.fw_version &&
+		    adev->vce.fw_version < AMDGPU_VCE_FW_53_45)
 			vm_size = min(vm_size, 1ULL << 40);
 
 		dev_info.virtual_address_offset = AMDGPU_VA_RESERVED_SIZE;