Index: linux-user/syscall.c
===================================================================
--- linux-user/syscall.c	(revision 5518)
+++ linux-user/syscall.c	(working copy)
@@ -1934,6 +1934,7 @@
     __put_user(host_msginfo->msgtql, &target_msginfo->msgtql);
     __put_user(host_msginfo->msgseg, &target_msginfo->msgseg);
     unlock_user_struct(target_msginfo, target_addr, 1);
+    return 0;
 }
 
 static inline abi_long do_msgctl(int msgid, int cmd, abi_long ptr)