[POWERPC] of_detach_node()'s device node argument cannot be const

...since it modifies it (when it sets the OF_DETACHED flag).

Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index bdcd23d..a38197b 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1218,7 +1218,7 @@
  * a reference to the node.  The memory associated with the node
  * is not freed until its refcount goes to zero.
  */
-void of_detach_node(const struct device_node *np)
+void of_detach_node(struct device_node *np)
 {
 	struct device_node *parent;