cpufreq: brcmstb-avs-cpufreq: ISO C90 forbids mixed declarations

There is a compile warning because a NULL pointer check was added before
a struct was declared. This moves the NULL pointer check to after the
struct is declared and moves the struct assignment to after the NULL
pointer check.

Fixes: f661017e6d32 ("cpufreq: brcmstb-avs-cpufreq: add check for cpufreq_cpu_get's return value")
Signed-off-by: Portia Stephens <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/brcmstb-avs-cpufreq.c

···
 static unsigned int brcm_avs_cpufreq_get(unsigned int cpu)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
+	struct private_data *priv;
+
 	if (!policy)
 		return 0;
-	struct private_data *priv = policy->driver_data;
+
+	priv = policy->driver_data;
 
 	cpufreq_cpu_put(policy);