powercap: fix typo in a comment in idle_inject.c

Drop superfluous "the" from the comment in line 15.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
[ rjw: Subject edit, new changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/powercap/idle_inject.c

@@ -12,7 +12,7 @@
  *
  * All of the kthreads used for idle injection are created at init time.
  *
- * Next, the users of the the idle injection framework provide a cpumask via
+ * Next, the users of the idle injection framework provide a cpumask via
  * its register function. The kthreads will be synchronized with respect to
  * this cpumask.
  *