drm/msm: dsi: Remove redundant null check before clk_prepare_enable/clk_disable_unprepare

Because clk_prepare_enable() and clk_disable_unprepare() already checked
NULL clock parameter, so the additional checks are unnecessary, just
remove them.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201231095616.25973-1-vulab@iscas.ac.cnSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -558,13 +558,11 @@ int dsi_link_clk_enable_6g(struct msm_dsi_host *msm_host)
 		goto pixel_clk_err;
 	}
 
-	if (msm_host->byte_intf_clk) {
-		ret = clk_prepare_enable(msm_host->byte_intf_clk);
-		if (ret) {
-			pr_err("%s: Failed to enable byte intf clk\n",
-			       __func__);
-			goto byte_intf_clk_err;
-		}
+	ret = clk_prepare_enable(msm_host->byte_intf_clk);
+	if (ret) {
+		pr_err("%s: Failed to enable byte intf clk\n",
+			   __func__);
+		goto byte_intf_clk_err;
 	}
 
 	return 0;
@@ -660,8 +658,7 @@ void dsi_link_clk_disable_6g(struct msm_dsi_host *msm_host)
 	dev_pm_opp_set_rate(&msm_host->pdev->dev, 0);
 	clk_disable_unprepare(msm_host->esc_clk);
 	clk_disable_unprepare(msm_host->pixel_clk);
-	if (msm_host->byte_intf_clk)
-		clk_disable_unprepare(msm_host->byte_intf_clk);
+	clk_disable_unprepare(msm_host->byte_intf_clk);
 	clk_disable_unprepare(msm_host->byte_clk);
 }