PCI: armada8k: Remove useless test before clk_disable_unprepare()

clk_disable_unprepare() already checks that the clock pointer is valid.
No need to test it before calling it.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/dwc/pcie-armada8k.c

@@ -247,8 +247,7 @@ static int armada8k_pcie_probe(struct platform_device *pdev)
 	return 0;
 
 fail:
-	if (!IS_ERR(pcie->clk))
-		clk_disable_unprepare(pcie->clk);
+	clk_disable_unprepare(pcie->clk);
 
 	return ret;
 }