examples/l2fwd-crypto: fix stats array length
examples/l2fwd-crypto: fix stats array length

crypto_statistics array was not big enough for storing
all the possible crypto device statistics, as its size was
RTE_MAX_ETHPORTS, but should be RTE_CRYPTO_MAX_DEVS, leading
this to a potential out-of-bounds issue.

Coverity issue: 120145
Fixes: 387259bd6c67 ("examples/l2fwd-crypto: add sample application")

Signed-off-by: Slawomir Mrozowicz <e88e38a554fa6ee2c1af7d54e8bb48581354aa35@intel.com>
Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Declan Doherty <b4388acd850cd8caad5000a112795063f04807ac@intel.com>

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