cpufreq: s3c64xx: Fix compilation warning

The driver generates following warning when regulator support isn't
enabled in the kernel. Fix it.

   drivers/cpufreq/s3c64xx-cpufreq.c: In function 's3c64xx_cpufreq_set_target':
>> drivers/cpufreq/s3c64xx-cpufreq.c:55:22: warning: variable 'old_freq' set but not used [-Wunused-but-set-variable]
      55 |         unsigned int old_freq, new_freq;
         |                      ^~~~~~~~
>> drivers/cpufreq/s3c64xx-cpufreq.c:54:30: warning: variable 'dvfs' set but not used [-Wunused-but-set-variable]
      54 |         struct s3c64xx_dvfs *dvfs;
         |                              ^~~~

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501191803.CtfT7b2o-lkp@intel.com/
Cc: 5.4+ <stable@vger.kernel.org> # v5.4+
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/236b227e929e5adc04d1e9e7af6845a46c8e9432.1737525916.git.viresh.kumar@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: vireshk

drivers/cpufreq/s3c64xx-cpufreq.c

@@ -24,13 +24,15 @@ struct s3c64xx_dvfs {
 	unsigned int vddarm_max;
 };
 
+#ifdef CONFIG_REGULATOR
 static struct s3c64xx_dvfs s3c64xx_dvfs_table[] = {
 	[0] = { 1000000, 1150000 },
 	[1] = { 1050000, 1150000 },
 	[2] = { 1100000, 1150000 },
 	[3] = { 1200000, 1350000 },
 	[4] = { 1300000, 1350000 },
 };
+#endif
 
 static struct cpufreq_frequency_table s3c64xx_freq_table[] = {
 	{ 0, 0,  66000 },
@@ -51,15 +53,16 @@ static struct cpufreq_frequency_table s3c64xx_freq_table[] = {
 static int s3c64xx_cpufreq_set_target(struct cpufreq_policy *policy,
 				      unsigned int index)
 {
-	struct s3c64xx_dvfs *dvfs;
-	unsigned int old_freq, new_freq;
+	unsigned int new_freq = s3c64xx_freq_table[index].frequency;
 	int ret;
 
+#ifdef CONFIG_REGULATOR
+	struct s3c64xx_dvfs *dvfs;
+	unsigned int old_freq;
+
 	old_freq = clk_get_rate(policy->clk) / 1000;
-	new_freq = s3c64xx_freq_table[index].frequency;
 	dvfs = &s3c64xx_dvfs_table[s3c64xx_freq_table[index].driver_data];
 
-#ifdef CONFIG_REGULATOR
 	if (vddarm && new_freq > old_freq) {
 		ret = regulator_set_voltage(vddarm,
 					    dvfs->vddarm_min,