tools/power turbostat: Fix trailing '\n' parsing

parse_cpu_string() parses the string input either from command line or
from /sys/fs/cgroup/cpuset.cpus.effective to get a list of CPUs that
turbostat can run with.

The cpu string returned by /sys/fs/cgroup/cpuset.cpus.effective contains
a trailing '\n', but strtoul() fails to treat this as an error.

That says, for the code below
	val = ("\n", NULL, 10);
val returns 0, and errno is also not set.

As a result, CPU0 is erroneously considered as allowed CPU and this
causes failures when turbostat tries to run on CPU0.

 get_counters: Could not migrate to CPU 0
 ...
 turbostat: re-initialized with num_cpus 8, allowed_cpus 5
 get_counters: Could not migrate to CPU 0

Add a check to return immediately if '\n' or '\0' is detected.

Fixes: 8c3dd2c ("tools/power/turbostat: Abstrct function for parsing cpu string")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

tools/power/x86/turbostat/turbostat.c

@@ -5389,6 +5389,9 @@ static int parse_cpu_str(char *cpu_str, cpu_set_t *cpu_set, int cpu_set_size)
 		if (*next == '-')	/* no negative cpu numbers */
 			return 1;
 
+		if (*next == '\0' || *next == '\n')
+			break;
+
 		start = strtoul(next, &next, 10);
 
 		if (start >= CPU_SUBSET_MAXCPUS)