In msgrcv(), set msgtyp correctly. Hardwiring 0 as the message type

yields incorrect behaviour. The hardwiring was present in the very
first commit that implemented msgrcv() (revision 1.4) and hasn't been
changed since. The native implementation was complete at that time,
so there doesn't seem to be a reason for the hardwiring from a
technical point of view.

Submitted by: Reinier Bezuidenhout <rbezuide@yahoo.com>

sys/compat/linux/linux_ipc.c

@@ -358,7 +358,7 @@ linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
     bsd_args.msqid = args->msqid;
     bsd_args.msgp = args->msgp;
     bsd_args.msgsz = args->msgsz;
-    bsd_args.msgtyp = 0; /* XXX - args->msgtyp; */
+    bsd_args.msgtyp = args->msgtyp;
     bsd_args.msgflg = args->msgflg;
     return msgrcv(td, &bsd_args);
 }