watchdog: xilinx: Read clock frequency directly from DT node

Do not use clock-frequency property from parent node.
Use it from watchdog node.

Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-By: Alejandro Cabrera <acabrera@udio.cujae.edu.cu>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/of_xilinx_wdt.c

@@ -297,7 +297,7 @@ static int __devinit xwdt_probe(struct platform_device *pdev)
 
 	no_timeout = 0;
 
-	pfreq = (u32 *)of_get_property(pdev->dev.of_node->parent,
+	pfreq = (u32 *)of_get_property(pdev->dev.of_node,
 					"clock-frequency", NULL);
 
 	if (pfreq == NULL) {