drm/msm/dpu: remove extra drm_encoder_cleanup from the error path

The drmm handler will perform drm_encoder_cleanup() for us. Moreover if
we call drm_encoder_cleanup() manually, the drmm_encoder_alloc_release()
will spawn warnings at drivers/gpu/drm/drm_encoder.c:214. Drop these
extra drm_encoder_cleanup() calls.

Fixes: cd42c56d ("drm/msm/dpu: use drmm-managed allocation for dpu_encoder_virt")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reported-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Tested-by: Abhinav Kumar <quic_abhinavk@quicinc.com> #sm8250 CI
Patchwork: https://patchwork.freedesktop.org/patch/571562/
Link: https://lore.kernel.org/r/20231211145440.3647001-1-dmitry.baryshkov@linaro.org

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

@@ -586,7 +586,6 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
 		rc = msm_dp_modeset_init(priv->dp[i], dev, encoder);
 		if (rc) {
 			DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
-			drm_encoder_cleanup(encoder);
 			return rc;
 		}
 	}
@@ -619,7 +618,6 @@ static int _dpu_kms_initialize_hdmi(struct drm_device *dev,
 	rc = msm_hdmi_modeset_init(priv->hdmi, dev, encoder);
 	if (rc) {
 		DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
-		drm_encoder_cleanup(encoder);
 		return rc;
 	}
 
@@ -651,7 +649,6 @@ static int _dpu_kms_initialize_writeback(struct drm_device *dev,
 			n_formats);
 	if (rc) {
 		DPU_ERROR("dpu_writeback_init, rc = %d\n", rc);
-		drm_encoder_cleanup(encoder);
 		return rc;
 	}