[SPARC64]: Port over IPC msg{snd,rcv} compat32 fixes from ia64.

arch/sparc64/kernel/sys_sparc32.c

@@ -480,7 +480,7 @@ static int do_sys32_semctl(int first, int second, int third, void *uptr)
 
 static int do_sys32_msgsnd (int first, int second, int third, void *uptr)
 {
-	struct msgbuf *p = kmalloc (second + sizeof (struct msgbuf) + 4, GFP_USER);
+	struct msgbuf *p = kmalloc (second + sizeof (struct msgbuf), GFP_USER);
 	struct msgbuf32 *up = (struct msgbuf32 *)uptr;
 	mm_segment_t old_fs;
 	int err;
@@ -522,12 +522,12 @@ static int do_sys32_msgrcv (int first, int second, int msgtyp, int third,
 		msgtyp = ipck.msgtyp;
 	}
 	err = -ENOMEM;
-	p = kmalloc (second + sizeof (struct msgbuf) + 4, GFP_USER);
+	p = kmalloc (second + sizeof (struct msgbuf), GFP_USER);
 	if (!p)
 		goto out;
 	old_fs = get_fs ();
 	set_fs (KERNEL_DS);
-	err = sys_msgrcv (first, p, second + 4, msgtyp, third);
+	err = sys_msgrcv (first, p, second, msgtyp, third);
 	set_fs (old_fs);
 	if (err < 0)
 		goto free_then_out;