net/bnxt: do not log error if stats queried before start
net/bnxt: do not log error if stats queried before start

When using pktgen lots of unnecessary errors are printed
because pktgen queries statistics before device is started.

Fixes: 3e92fd4e4ec0 ("net/bnxt: use dynamic log type")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>
Reviewed-by: Ajit Khaparde <01965fbd61169dc18f3fb5e13de7f67d298f8924@broadcom.com>

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