[PATCH 1/4] drm/msm/dpu: replace IS_ERR_OR_NULL with IS_ERR during DSC init

[Dmitry Baryshkov]

Using IS_ERR_OR_NULL() together with PTR_ERR() is a typical mistake. If
the value is NULL, then the function will return 0 instead of a proper
return code. Moreover dpu_hw_dsc_init() can not return NULL.
Replace all dpu_rm_init()'s IS_ERR_OR_NULL() calls with IS_ERR().

This follows the commit 740828c73a36 ("drm/msm/dpu: fix error handling
in dpu_rm_init"), which removed IS_ERR_OR_NULL() from RM init code, but
then the commit f2803ee91a41 ("drm/msm/disp/dpu1: Add DSC support in
RM") added it back for DSC init.

Suggested-by: Marijn Suijten <marijn.suij...@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index f0fc70422e56..dffd3dd0a877 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -247,7 +247,7 @@ int dpu_rm_init(struct dpu_rm *rm,
                const struct dpu_dsc_cfg *dsc = &cat->dsc[i];
 
                hw = dpu_hw_dsc_init(dsc, mmio);
-               if (IS_ERR_OR_NULL(hw)) {
+               if (IS_ERR(hw)) {
                        rc = PTR_ERR(hw);
                        DPU_ERROR("failed dsc object creation: err %d\n", rc);
                        goto fail;
-- 
2.39.2