Subject: fix build breakage in drivers/staging/iio/industrialio-core.c

This was introduced in commit b4641336
(iio: fix a leak due to improper use of anon_inode_getfd())

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>