ipc: rename ipc_obtain_object

...  to ipc_obtain_object_idr, which is more meaningful and makes the code
slightly easier to follow.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --cc ipc/msg.c
Simple merge

diff --cc ipc/sem.c
Simple merge

diff --cc ipc/shm.c
Simple merge

diff --cc ipc/util.c
Simple merge

diff --cc ipc/util.h
Simple merge