[PATCH] simplify container_of_const()

[Alexey Dobriyan]

* add necessary parenthesis so that

	container_of_const((expr1, expr2), T, member)

  compiles without warnings,

* delete unnecessary parenthesis,

* delete unnecessary cast:

	container_of(ptr, T, member)

  has type "T*" and doesn't need any more casts.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 include/linux/container_of.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/include/linux/container_of.h
+++ b/include/linux/container_of.h
@@ -30,9 +30,9 @@
  * @member:		the name of the member within the struct.
  */
 #define container_of_const(ptr, type, member)				\
-	_Generic(ptr,							\
-		const typeof(*(ptr)) *: ((const type *)container_of(ptr, type, member)),\
-		default: ((type *)container_of(ptr, type, member))	\
+	_Generic((ptr),							\
+		const typeof(*(ptr)) *: (const type *)container_of(ptr, type, member),\
+		default: container_of(ptr, type, member)		\
 	)
 
 #endif	/* _LINUX_CONTAINER_OF_H */