[PATCH v2] drm/msm: Move call to PTR_ERR_OR_ZERO after reassignment

[Vaishali Thakkar]

Here, a location is reset to NULL before being passed to PTR_ERR.
So, PTR_ERR should be called before its argument is reassigned
to NULL. Further to simplify things use PTR_ERR_OR_ZERO instead
of PTR_ERR and IS_ERR.

Problem found using Coccinelle.

Signed-off-by: Vaishali Thakkar <vaishali.thakkar at oracle.com>
Reviewed-by: Eric Engestrom <eric.engestrom at imgtec.com>
---
Changes since v1:
        - No functional changes, just make two pr_err() to print
          the same format
---
 drivers/gpu/drm/msm/edp/edp_ctrl.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c 
b/drivers/gpu/drm/msm/edp/edp_ctrl.c
index 81200e9..e10fa810 100644
--- a/drivers/gpu/drm/msm/edp/edp_ctrl.c
+++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c
@@ -302,21 +302,24 @@ static void edp_clk_disable(struct edp_ctrl *ctrl, u32 
clk_mask)
 static int edp_regulator_init(struct edp_ctrl *ctrl)
 {
        struct device *dev = &ctrl->pdev->dev;
+       int ret;

        DBG("");
        ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
-       if (IS_ERR(ctrl->vdda_vreg)) {
+       ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
+       if (ret) {
                pr_err("%s: Could not get vdda reg, ret = %ld\n", __func__,
-                               PTR_ERR(ctrl->vdda_vreg));
+                               ret);
                ctrl->vdda_vreg = NULL;
-               return PTR_ERR(ctrl->vdda_vreg);
+               return ret;
        }
        ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
-       if (IS_ERR(ctrl->lvl_vreg)) {
-               pr_err("Could not get lvl-vdd reg, %ld",
-                               PTR_ERR(ctrl->lvl_vreg));
+       ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
+       if (ret) {
+               pr_err("%s: Could not get lvl-vdd reg, ret = %ld\n", __func__,
+                               ret);
                ctrl->lvl_vreg = NULL;
-               return PTR_ERR(ctrl->lvl_vreg);
+               return ret;
        }

        return 0;
-- 
2.1.4