Don't include <linux/list.h> from user-visible part of linux/msg.h

Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

include/linux/msg.h

@@ -2,7 +2,6 @@
 #define _LINUX_MSG_H
 
 #include <linux/ipc.h>
-#include <linux/list.h>
 
 /* ipcs ctl commands */
 #define MSG_STAT 11
@@ -63,6 +62,7 @@ struct msginfo {
 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
 
 #ifdef __KERNEL__
+#include <linux/list.h>
 
 /* one msg_msg structure for each message */
 struct msg_msg {