[CPUFREQ] kill cpufreq_driver export.

From Dominik Brodowski.
This removes the special export of cpufreq_driver for proc_intf.c. Instead,
the behaviour of /proc/cpufreq previous of Greg's class re-write is back:
the check whether cpufreq_driver is loaded is done within cpufreq_cpu_get

drivers/cpufreq/proc_intf.c

@@ -209,9 +209,6 @@ static int __init cpufreq_proc_init (void)
 {
 	struct proc_dir_entry *entry = NULL;
 
-	if (!cpufreq_driver)
-		return -ENODEV;
-
 	/* are these acceptable values? */
 	entry = create_proc_entry("cpufreq", S_IFREG|S_IRUGO|S_IWUSR, 
 				  &proc_root);

kernel/cpufreq.c

@@ -29,12 +29,9 @@
  * level driver of CPUFreq support, and its locking mutex. 
  * cpu_max_freq is in kHz.
  */
-struct cpufreq_driver   	*cpufreq_driver;
+static struct cpufreq_driver   	*cpufreq_driver;
 static DECLARE_MUTEX            (cpufreq_driver_sem);
 
-/* required for the proc interface, remove when that goes away */
-EXPORT_SYMBOL_GPL(cpufreq_driver);
-
 /**
  * Two notifier lists: the "policy" list is involved in the 
  * validation process for a new CPU frequency policy; the 
@@ -58,6 +55,9 @@ static int cpufreq_cpu_get(unsigned int cpu) {
 	if (cpu >= NR_CPUS)
 		return 0;
 
+	if (!cpufreq_driver)
+		return 0;
+
 	if (!try_module_get(cpufreq_driver->owner))
 		return 0;