fix: add missing closedir in _get_max_cpuid_from_sysfs()

fix: add missing closedir in _get_max_cpuid_from_sysfs()

As reported by Coverity:

*** CID 1490849:    (RESOURCE_LEAK)
/src/common/smp.c: 84 in _get_max_cpuid_from_sysfs()
78     	 * CPU num of 0.
79     	 */
80     	if (max_cpuid < 0 || max_cpuid > INT_MAX)
81     		max_cpuid = -1;
82
83     end:
>>>     CID 1490849:    (RESOURCE_LEAK)
>>>     Variable "cpudir" going out of scope leaks the storage it points to.
84     	return max_cpuid;
85     }
86
87     /*
88      * As a fallback to parsing the CPU mask in "/sys/devices/system/cpu/possible",
89      * iterate on all the folders in "/sys/devices/system/cpu" that start with

Change-Id: I2048e2473d66aaa2a275fe2923da84a7e105f235
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>