add mq_bytes to user_struct

Add mq_bytes field to user_struct, and make sure it's properly
initialized.

--- 2.6-rlimit/include/linux/sched.h~mqueue_rlimit	2004-05-10 22:29:32.558320808 -0700
+++ 2.6-rlimit/include/linux/sched.h	2004-05-10 22:30:44.527379848 -0700
@@ -315,6 +315,8 @@
 	atomic_t processes;	/* How many processes does this user have? */
 	atomic_t files;		/* How many open files does this user have? */
 	atomic_t sigpending;	/* How many pending signals does this user have? */
+	/* protected by mq_lock	*/
+	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
 
 	/* Hash table maintenance information */
 	struct list_head uidhash_list;
--- 2.6-rlimit/kernel/user.c~mqueue_rlimit	2004-05-10 22:29:03.741701600 -0700
+++ 2.6-rlimit/kernel/user.c	2004-05-10 22:30:44.531379240 -0700
@@ -32,6 +32,7 @@
 	.processes	= ATOMIC_INIT(1),
 	.files		= ATOMIC_INIT(0),
 	.sigpending	= ATOMIC_INIT(0),
+	.mq_bytes	= 0
 };
 
 /*
@@ -111,6 +112,8 @@
 		atomic_set(&new->files, 0);
 		atomic_set(&new->sigpending, 0);
 
+		new->mq_bytes = 0;
+
 		/*
 		 * Before adding this, check whether we raced
 		 * on adding the same user already..
-
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