cpuidle: teo: Rename local variable in teo_select()

commit 4f690bb8 upstream.

Rename a local variable in teo_select() in preparation for subsequent
code modifications, no intentional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>