tools/power x86_energy_perf_policy: Fix format string in error message

The error message in validate_cpu_selected_set() uses an incomplete
format specifier "cpu%" instead of "cpu%d", resulting in the error
message printing "Requested cpu% is not present" rather than
showing the actual CPU number.

Fix the format string to properly display the CPU number.

Signed-off-by: Malaya Kumar Rout <[e-mail]>
Signed-off-by: Len Brown <[e-mail]>

tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c

···
 	for (cpu = 0; cpu <= max_cpu_num; ++cpu) {
 		if (CPU_ISSET_S(cpu, cpu_setsize, cpu_selected_set))
 			if (!CPU_ISSET_S(cpu, cpu_setsize, cpu_present_set))
-				errx(1, "Requested cpu% is not present", cpu);
+				errx(1, "Requested cpu%d is not present", cpu);
 	}
 }