[CPUFREQ] Remove duplicate check in powernow-k8

Remove a duplicate NULL pointer check introduced by commit
4211a30349e8d2b724cfb4ce2584604f5e59c299

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Dave Jones <davej@redhat.com>

arch/i386/kernel/cpu/cpufreq/powernow-k8.c

@@ -1106,9 +1106,6 @@ static unsigned int powernowk8_get (unsigned int cpu)
 
 	data = powernow_data[first_cpu(cpu_core_map[cpu])];
 
-	if (!data)
-		return -EINVAL;
-
 	if (!data)
 		return -EINVAL;