brcmfmac: remove empty brcmf_proto_stop

remove empty brcmf_proto_stop from protocol layer
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Franky Lin <frankyl@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_cdc.c

@@ -385,8 +385,3 @@ void brcmf_proto_detach(struct brcmf_pub *drvr)
 	kfree(drvr->prot);
 	drvr->prot = NULL;
 }
-
-void brcmf_proto_stop(struct brcmf_pub *drvr)
-{
-	/* Nothing to do for CDC */
-}

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

@@ -1150,9 +1150,6 @@ static void brcmf_bus_detach(struct brcmf_pub *drvr)
 	brcmf_dbg(TRACE, "Enter\n");
 
 	if (drvr) {
-		/* Stop the protocol module */
-		brcmf_proto_stop(drvr);
-
 		/* Stop the bus module */
 		brcmf_bus_stop(drvr->bus_if);
 	}

drivers/net/wireless/brcm80211/brcmfmac/dhd_proto.h

@@ -27,9 +27,6 @@ int brcmf_proto_attach(struct brcmf_pub *drvr);
 /* Unlink, frees allocated protocol memory (including brcmf_proto) */
 void brcmf_proto_detach(struct brcmf_pub *drvr);
 
-/* Stop protocol: sync w/dongle state. */
-void brcmf_proto_stop(struct brcmf_pub *drvr);
-
 /* Add any protocol-specific data header.
  * Caller must reserve prot_hdrlen prepend space.
  */