ipc,sem: fix use after free on IPC_RMID v2

From: Herton R. Krzesinski
Date: Tue Aug 11 2015 - 13:19:21 EST

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.

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