ipc,sem: fix use after free on IPC_RMID v2

[Herton R. Krzesinski]

This is a followup series for the patch sent previously, on thread:
"[PATCH] ipc,sem: fix use after free on IPC_RMID after a task using same semaphore set exits"

The IPC_RMID race fix is split into a single patch with Cc: to stable including
suggestions made previously.

The removal of uneeded ulp->lock usage is moved into a new patch.

Thanks,
Herton.
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