cpufreq: vexpress: Drop unused variable

arm:allmodconfig fails to build with the following error.

drivers/cpufreq/vexpress-spc-cpufreq.c:454:13: error:
unused variable 'cur_cluster'

Remove the unused variable.

Fixes: bb8c26d9387f ("cpufreq: vexpress: Set CPUFREQ_IS_COOLING_DEV flag")
Cc: Viresh Kumar <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/vexpress-spc-cpufreq.c

···
 static int ve_spc_cpufreq_exit(struct cpufreq_policy *policy)
 {
 	struct device *cpu_dev;
-	int cur_cluster = cpu_to_cluster(policy->cpu);
 
 	cpu_dev = get_cpu_device(policy->cpu);
 	if (!cpu_dev) {