net: bnxt: Fix a uninitialized variable warning.

Fix the following compile warning:

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c:49:5: warning: ‘nvm_param.dir_type’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (nvm_param.dir_type == BNXT_NVM_PORT_CFG)
Signed-off-by: Nzhong jiang <zhongjiang@huawei.com>
Acked-by: NMichael Chan <michael.chan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -46,6 +46,9 @@ static int bnxt_hwrm_nvm_req(struct bnxt *bp, u32 param_id, void *msg,
 		}
 	}
 
+	if (i == ARRAY_SIZE(nvm_params))
+		return -EOPNOTSUPP;
+
 	if (nvm_param.dir_type == BNXT_NVM_PORT_CFG)
 		idx = bp->pf.port_id;
 	else if (nvm_param.dir_type == BNXT_NVM_FUNC_CFG)