net/bnxt: fix typo in log message

net/bnxt: fix typo in log message

In bnxt_rss_hash_update_op, check for valid RSS hashkey length is
made against size HW_HASH_KEY_SIZE(40). But the failure log says
"Invalid hashkey length, should be 16 bytes".

Fixes: 91aee9711ee3 ("net/bnxt: validate RSS hash key length")
Cc: stable@dpdk.org
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>