cpufreq: nforce2: Remove empty exit() callback

The exit() callback is optional, remove the empty one.

Signed-off-by: Viresh Kumar <[e-mail]>
Acked-by: Rafael J. Wysocki <[e-mail]>

drivers/cpufreq/cpufreq-nforce2.c

···
 	return 0;
 }
 
-static int nforce2_cpu_exit(struct cpufreq_policy *policy)
-{
-	return 0;
-}
-
 static struct cpufreq_driver nforce2_driver = {
 	.name = "nforce2",
 	.flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
···
 	.target = nforce2_target,
 	.get = nforce2_get,
 	.init = nforce2_cpu_init,
-	.exit = nforce2_cpu_exit,
 };
 
 #ifdef MODULE