do_epoll_ctl(): clean the failure exits up a bit

commit 52c479697c9b73f628140dcdfcd39ea302d05482 upstream.

Change-Id: I22cfeaefef7dd2c968d1bf8761c702446cf6242b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: b3ce6ca9
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Srinivasarao P <spathi@codeaurora.org>