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Missing unlock_user_struct , Deadlock

From: Mansour Ahmadi
Subject: Missing unlock_user_struct , Deadlock
Date: Fri, 13 Mar 2020 00:52:42 -0400
Hi

In the case of badframe, user struct is not unlocked here and may lead to deadlock:

https://github.com/qemu/qemu/blob/d4f7d56759f7c75270c13d5f3f5f736a9558929c/linux-user/m68k/signal.c#L380

In similar case, it in unlocked correctly:
https://github.com/qemu/qemu/blob/d4f7d56759f7c75270c13d5f3f5f736a9558929c/linux-user/sh4/signal.c#L303

Thanks,
Mansour
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