brcmfmac: avoid firmware command in brcmf_netdev_open() when bus is down

No point in sending a firmware command when bus is down so make it
conditional checking the state.
Reviewed-by: NHante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: NFranky Lin <franky.lin@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c

@@ -579,7 +579,8 @@ static int brcmf_netdev_stop(struct net_device *ndev)
 
 	brcmf_cfg80211_down(ndev);
 
-	brcmf_fil_iovar_data_set(ifp, "arp_hostip_clear", NULL, 0);
+	if (ifp->drvr->bus_if->state == BRCMF_BUS_UP)
+		brcmf_fil_iovar_data_set(ifp, "arp_hostip_clear", NULL, 0);
 
 	brcmf_net_setcarrier(ifp, false);