tools/power x86_energy_perf_policy: Fix file leak in get_pkg_num()

In function get_pkg_num() if fopen_or_die() succeeds it returns a file
pointer to be used. But fclose() is never called before returning from
the function.

Signed-off-by: Samasth Norway Ananda <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c

···
 	retval = fscanf(fp, "%d\n", &pkg);
 	if (retval != 1)
 		errx(1, "%s: failed to parse", pathname);
+	fclose(fp);
 	return pkg;
 }