drm/msm: remove unneeded variable

Fix the following coccicheck REVIEW:
./drivers/gpu/drm/msm/edp/edp_ctrl.c:1245:5-8 Unneeded variable
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Chi Minghao <chi.minghao@zte.com.cn>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210831115127.18236-1-chi.minghao@zte.com.cnSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/edp/edp_ctrl.c

@@ -1243,8 +1243,6 @@ bool msm_edp_ctrl_panel_connected(struct edp_ctrl *ctrl)
 int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
 		struct drm_connector *connector, struct edid **edid)
 {
-	int ret = 0;
-
 	mutex_lock(&ctrl->dev_mutex);
 
 	if (ctrl->edid) {
@@ -1279,7 +1277,7 @@ int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
 	}
 unlock_ret:
 	mutex_unlock(&ctrl->dev_mutex);
-	return ret;
+	return 0;
 }
 
 int msm_edp_ctrl_timing_cfg(struct edp_ctrl *ctrl,