BugLink: http://bugs.launchpad.net/bugs/1617550

Building fuse as a module fails because this symbol is not
exported.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>