examples/l2fwd-crypto: avoid too many tabs
examples/l2fwd-crypto: avoid too many tabs

Some extra functions have been created to avoid
too many nested conditionals.

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Declan Doherty <b4388acd850cd8caad5000a112795063f04807ac@intel.com>
Acked-by: Akhil Goyal <74d7c4c993a22c1d4f60c46ff3d95c969a24a25c@nxp.com>
Acked-by: Fiona Trahe <7ba562cc372916cd557d0be347608f8b4da4f746@intel.com>

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