Fix a couple of compile warnings found when compiling on a ppc64 build box.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>

Disk based heartbeat. Configured and started from userspace, the
kernel component handles I/O submission and event generation via
callback mechanism.
Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: NKurt Hackel <kurt.hackel@oracle.com>