drm/amd/amdgpu: Clean up gfx_v8_0_mqd_init()

Clean up a toggle with ?:.
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4722,14 +4722,10 @@ static int gfx_v8_0_mqd_init(struct amdgpu_ring *ring)
 	mqd->cp_hqd_eop_control = tmp;
 
 	/* enable doorbell? */
-	tmp = RREG32(mmCP_HQD_PQ_DOORBELL_CONTROL);
-
-	if (ring->use_doorbell)
-		tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL,
-					 DOORBELL_EN, 1);
-	else
-		tmp = REG_SET_FIELD(tmp, CP_HQD_PQ_DOORBELL_CONTROL,
-					 DOORBELL_EN, 0);
+	tmp = REG_SET_FIELD(RREG32(mmCP_HQD_PQ_DOORBELL_CONTROL),
+			    CP_HQD_PQ_DOORBELL_CONTROL,
+			    DOORBELL_EN,
+			    ring->use_doorbell ? 1 : 0);
 
 	mqd->cp_hqd_pq_doorbell_control = tmp;