drm/msm/dpu: dont_use IS_ERR_OR_NULL for encoder phys backends

The functions dpu_encoder_phys_foo_init() can not return NULL. Replace
corresponding IS_ERR_OR_NULL() checks with just IS_ERR().
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/485452/
Link: https://lore.kernel.org/r/20220507115942.1705872-1-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -2142,10 +2142,10 @@ static int dpu_encoder_virt_add_phys_encs(
 	if (disp_info->capabilities & MSM_DISPLAY_CAP_VID_MODE) {
 		enc = dpu_encoder_phys_vid_init(params);
 
-		if (IS_ERR_OR_NULL(enc)) {
+		if (IS_ERR(enc)) {
 			DPU_ERROR_ENC(dpu_enc, "failed to init vid enc: %ld\n",
 				PTR_ERR(enc));
-			return enc == NULL ? -EINVAL : PTR_ERR(enc);
+			return PTR_ERR(enc);
 		}
 
 		dpu_enc->phys_encs[dpu_enc->num_phys_encs] = enc;
@@ -2155,10 +2155,10 @@ static int dpu_encoder_virt_add_phys_encs(
 	if (disp_info->capabilities & MSM_DISPLAY_CAP_CMD_MODE) {
 		enc = dpu_encoder_phys_cmd_init(params);
 
-		if (IS_ERR_OR_NULL(enc)) {
+		if (IS_ERR(enc)) {
 			DPU_ERROR_ENC(dpu_enc, "failed to init cmd enc: %ld\n",
 				PTR_ERR(enc));
-			return enc == NULL ? -EINVAL : PTR_ERR(enc);
+			return PTR_ERR(enc);
 		}
 
 		dpu_enc->phys_encs[dpu_enc->num_phys_encs] = enc;
@@ -2168,10 +2168,10 @@ static int dpu_encoder_virt_add_phys_encs(
 	if (disp_info->intf_type == DRM_MODE_ENCODER_VIRTUAL) {
 		enc = dpu_encoder_phys_wb_init(params);
 
-		if (IS_ERR_OR_NULL(enc)) {
+		if (IS_ERR(enc)) {
 			DPU_ERROR_ENC(dpu_enc, "failed to init wb enc: %ld\n",
 					PTR_ERR(enc));
-			return enc == NULL ? -EINVAL : PTR_ERR(enc);
+			return PTR_ERR(enc);
 		}
 
 		dpu_enc->phys_encs[dpu_enc->num_phys_encs] = enc;