PowerPC-83xx: Deletion of an unnecessary check before the function call "of_node_put"

The of_node_put() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/platforms/83xx/usb.c

@@ -162,7 +162,6 @@ int mpc831x_usb_cfg(void)
 
 	iounmap(immap);
 
-	if (immr_node)
 	of_node_put(immr_node);
 
 	/* Map USB SOC space */