net: phy: mdio-mux-bcm-iproc: check clk_prepare_enable() return value

Check clk_prepare_enable() return value.

Fixes: 2c723044 ("net: phy: Add pm support to Broadcom iProc mdio mux driver")
Signed-off-by: NRayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/mdio-mux-bcm-iproc.c

@@ -288,8 +288,13 @@ static int mdio_mux_iproc_suspend(struct device *dev)
 static int mdio_mux_iproc_resume(struct device *dev)
 {
 	struct iproc_mdiomux_desc *md = dev_get_drvdata(dev);
+	int rc;
 
-	clk_prepare_enable(md->core_clk);
+	rc = clk_prepare_enable(md->core_clk);
+	if (rc) {
+		dev_err(md->dev, "failed to enable core clk\n");
+		return rc;
+	}
 	mdio_mux_iproc_config(md);
 
 	return 0;