clk: mvebu: armada-37xx-periph: Use PTR_ERR_OR_ZERO()

Fix ptr_ret.cocci warnings:
drivers/clk/mvebu/armada-37xx-periph.c:362:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci
Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/mvebu/armada-37xx-periph.c

@@ -359,10 +359,7 @@ static int armada_3700_add_composite_clk(const struct clk_periph_data *data,
 				       mux_ops, rate_hw, rate_ops,
 				       gate_hw, gate_ops, CLK_IGNORE_UNUSED);
 
-	if (IS_ERR(*hw))
-		return PTR_ERR(*hw);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(*hw);
 }
 
 static int armada_3700_periph_clock_probe(struct platform_device *pdev)