tools/power turbostat: Fix file pointer leak

Currently if a fscanf fails then an early return leaks an open
file pointer. Fix this by fclosing the file before the return.
Detected using static analysis with cppcheck:

tools/power/x86/turbostat/turbostat.c:2039:3: error: Resource leak: fp [resourceLeak]

Fixes: eae97e0 ("tools/power turbostat: Support thermal throttle count print")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Chen Yu <yu.c.chen@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

tools/power/x86/turbostat/turbostat.c

@@ -2035,9 +2035,9 @@ int get_core_throt_cnt(int cpu, unsigned long long *cnt)
 	if (!fp)
 		return -1;
 	ret = fscanf(fp, "%lld", &tmp);
+	fclose(fp);
 	if (ret != 1)
 		return -1;
-	fclose(fp);
 	*cnt = tmp;
 
 	return 0;