net/bnxt: return error in stats if init is not complete

net/bnxt: return error in stats if init is not complete

return error if init is not complete before accessing stats.

Fixes: ed2ced6fe927 ("net/bnxt: check initialization before accessing stats")
Cc: stable@dpdk.org
Signed-off-by: Jay Ding <jay.ding@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Randy Schacher <stuart.schacher@broadcom.com>
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>