drm/msm/dpu: ignore NULL clocks

This isn't an error.  Also the clk APIs handle the NULL case, so we can
just delete the check.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>

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

@@ -93,19 +93,12 @@ int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
 			DEV_DBG("%pS->%s: enable '%s'\n",
 				__builtin_return_address(0), __func__,
 				clk_arry[i].clk_name);
-			if (clk_arry[i].clk) {
-				rc = clk_prepare_enable(clk_arry[i].clk);
-				if (rc)
-					DEV_ERR("%pS->%s: %s en fail. rc=%d\n",
-						__builtin_return_address(0),
-						__func__,
-						clk_arry[i].clk_name, rc);
-			} else {
-				DEV_ERR("%pS->%s: '%s' is not available\n",
-					__builtin_return_address(0), __func__,
-					clk_arry[i].clk_name);
-				rc = -EPERM;
-			}
+			rc = clk_prepare_enable(clk_arry[i].clk);
+			if (rc)
+				DEV_ERR("%pS->%s: %s en fail. rc=%d\n",
+					__builtin_return_address(0),
+					__func__,
+					clk_arry[i].clk_name, rc);
 
 			if (rc && i) {
 				msm_dss_enable_clk(&clk_arry[i - 1],
@@ -119,12 +112,7 @@ int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
 				__builtin_return_address(0), __func__,
 				clk_arry[i].clk_name);
 
-			if (clk_arry[i].clk)
-				clk_disable_unprepare(clk_arry[i].clk);
-			else
-				DEV_ERR("%pS->%s: '%s' is not available\n",
-					__builtin_return_address(0), __func__,
-					clk_arry[i].clk_name);
+			clk_disable_unprepare(clk_arry[i].clk);
 		}
 	}