net/hinic: fix snprintf length of cable info
net/hinic: fix snprintf length of cable info

Correct length and remove unnecessary brackets.

Fixes: d9ce1917941c ("net/hinic/base: add hardware operation")
Cc: stable@dpdk.org

Signed-off-by: Kevin Traynor <1f46c93815774a2e602547cf1e37c682d62b566d@redhat.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

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