Avoid pointer type value compared with 0 to make code clear.

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
---
 tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
index 5fd9e59..fd2b982 100644
--- a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
+++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
@@ -1517,7 +1517,7 @@ int main(int argc, char **argv)
 	parse_cpuid();
 
 	 /* If CPU-set and PKG-set are not initialized, default to all CPUs */
-	if ((cpu_selected_set == 0) && (pkg_selected_set == 0))
+	if ((cpu_selected_set == NULL) && (pkg_selected_set == 0))
 		cpu_selected_set = cpu_present_set;
 
 	/*
-- 
2.7.4