'parse_xstats_ids()' return 'int'. The return value is assigned to
'nb_xstats_ids' unsigned value, later negative check on this variable is
wrong.
Adding interim 'int' variable for negative check.
Fixes: 7ac16a3660c0 ("app/proc-info: support xstats by ID and by name")
Cc: stable@dpdk.org
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
59b981c6f6