epoll: do not insert into poll queues until all sanity checks are done

Issue: FP3SEC-211
Change-Id: Ic72328e7ef18af5f0b6414d1097a9096431a9ecc
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
(cherry picked from commit f8d4f44df056c5b504b0d49683fb7279218fd207)
1 file changed