examples/qos_sched: fix out-of-bounds option parsing
examples/qos_sched: fix out-of-bounds option parsing

overrun-local: Overrunning array tokens of 8 8-byte elements
at element index 4294967294 (byte offset 34359738352)
using index i (which evaluates to 4294967294).

Coverity issue: 30708
Fixes: de3cfa2c9823 ("sched: initial import")

Signed-off-by: Slawomir Mrozowicz <e88e38a554fa6ee2c1af7d54e8bb48581354aa35@intel.com>
Acked-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk