brcmfmac: only allocate firmware-signalling resources if required

Bail out of brcmf_fws_init() when no firmware-signalling is asked
for. Need to take this into account in brcmf_fws_deinit() as well.
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Piotr Haber <phaber@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c

@@ -982,7 +982,6 @@ void brcmf_detach(struct device *dev)
 	if (drvr->prot)
 		brcmf_proto_detach(drvr);
 
-	if (drvr->fws)
 	brcmf_fws_deinit(drvr);
 
 	brcmf_debugfs_detach(drvr);

drivers/net/wireless/brcm80211/brcmfmac/fwsignal.c

@@ -1224,8 +1224,9 @@ int brcmf_fws_init(struct brcmf_pub *drvr)
 	u32 tlv = 0;
 	int rc;
 
-	/* enable rssi signals */
-	if (drvr->fw_signals)
+	if (!drvr->fw_signals)
+		return 0;
+
 	tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS |
 	      BRCMF_FWS_FLAGS_XONXOFF_SIGNALS |
 	      BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS;
@@ -1277,6 +1278,9 @@ void brcmf_fws_deinit(struct brcmf_pub *drvr)
 	struct brcmf_fws_info *fws = drvr->fws;
 	ulong flags;
 
+	if (!fws)
+		return;
+
 	/* cleanup */
 	brcmf_fws_lock(drvr, flags);
 	brcmf_fws_cleanup(fws, -1);