tools/power x86_energy_perf_policy: close /proc/stat in for_every_cpu()

Instead of returning out of for_every_cpu() we should break out of the loop=
 which will then tidy up correctly by closing the file /proc/stat.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c

@@ -289,7 +289,7 @@ void for_every_cpu(void (func)(int))
 			"cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n",
 			&cpu);
 		if (retval != 1)
-			return;
+			break;
 
 		func(cpu);
 	}