path_openat(): fix double fput()

[ Upstream commit f15133df088ecadd141ea1907f2c96df67c729f0 ]

path_openat() jumps to the wrong place after do_tmpfile() - it has
already done path_cleanup() (as part of path_lookupat() called by
do_tmpfile()), so doing that again can lead to double fput().

Change-Id: Ia74c130ae5e379b512532c0feebea871b5f73668
Cc: stable@vger.kernel.org	# v3.11+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>