cpupowerutils: bench - Fix cpu online check

cpupower_is_cpu_online was incorrectly checking for 0. This patch fixes
this by checking for 1 when the cpu is online.
Signed-off-by: NAbhishek Goel <huntbag@linux.vnet.ibm.com>
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>

tools/power/cpupower/bench/system.c

@@ -61,7 +61,7 @@ int set_cpufreq_governor(char *governor, unsigned int cpu)
 
 	dprintf("set %s as cpufreq governor\n", governor);
 
-	if (cpupower_is_cpu_online(cpu) != 0) {
+	if (cpupower_is_cpu_online(cpu) != 1) {
 		perror("cpufreq_cpu_exists");
 		fprintf(stderr, "error: cpu %u does not exist\n", cpu);
 		return -1;