Staging: android: add __user annotation in binder.c

This fixes the following sparse error
drivers/staging/android/binder.c:1795:36: error: incompatible types in comparison expression (different address spaces)

Signed-off-by: Bojan Prtvar <prtvar.b@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 98ac020..19e6ba6 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -1773,7 +1773,7 @@
 		case BC_INCREFS_DONE:
 		case BC_ACQUIRE_DONE: {
 			void __user *node_ptr;
-			void *cookie;
+			void __user *cookie;
 			struct binder_node *node;
 
 			if (get_user(node_ptr, (void * __user *)ptr))