KSM: Only tune when there are changes to make

The KSM Controller tries to figure out if the policy has indicated any
changes to the ksm configuration.  When none are found, the Controller
should finish quietly with no call to the hypervisor interface.  Due to
an indentation error, it is calling the KSM tuning function
unconditionally.  Fix.

Change-Id: I2b082e35eae9d3a790da8c6e11e2c17fc70a056d
Signed-off-by: Adam Litke <agl@linux.vnet.ibm.com>
Reviewed-on: http://gerrit.ovirt.org/17711
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Doron Fediuck <dfediuck@redhat.com>
Reviewed-by: Adam Litke <agl@us.ibm.com>