Error out of ecryptfs_fsync() if filemap_write_and_wait() fails.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Cc: Paul Taysom <taysom@chromium.org>
Cc: Olof Johansson <olofj@chromium.org>
Cc: stable@vger.kernel.org # v3.6+