drm/msm/dpu: Remove useless checks in dpu_encoder

A couple more useless checks to remove in dpu_encoder.
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-10-sean@poorly.run #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-10-sean@poorly.run #v2
Link: https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-10-sean@poorly.run #v3

Changes in v2:
-None
Changes in v3:
-None
Changes in v4:
-None
Link: https://lore.kernel.org/r/20211105030434.2828845-10-sean@poorly.runSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -1148,10 +1148,6 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
 	struct msm_drm_private *priv;
 	struct drm_display_mode *cur_mode = NULL;
 
-	if (!drm_enc) {
-		DPU_ERROR("invalid encoder\n");
-		return;
-	}
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 
 	mutex_lock(&dpu_enc->enc_lock);
@@ -1197,14 +1193,6 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
 	struct msm_drm_private *priv;
 	int i = 0;
 
-	if (!drm_enc) {
-		DPU_ERROR("invalid encoder\n");
-		return;
-	} else if (!drm_enc->dev) {
-		DPU_ERROR("invalid dev\n");
-		return;
-	}
-
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
 	DPU_DEBUG_ENC(dpu_enc, "\n");