mwifiex: delete unused mwifiex_get_intf_num()

Commit 7afb94da ("mwifiex: update set_mac_address logic") fixed the
only user of this function, partly because the author seems to have
noticed that, as written, it's on the borderline between highly
misleading and buggy.

Anyway, no sense in keeping dead code around: let's drop it.

Fixes: 7afb94da ("mwifiex: update set_mac_address logic")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/main.h

@@ -1295,19 +1295,6 @@ mwifiex_copy_rates(u8 *dest, u32 pos, u8 *src, int len)
 	return pos;
 }
 
-/* This function return interface number with the same bss_type.
- */
-static inline u8
-mwifiex_get_intf_num(struct mwifiex_adapter *adapter, u8 bss_type)
-{
-	u8 i, num = 0;
-
-	for (i = 0; i < adapter->priv_num; i++)
-		if (adapter->priv[i] && adapter->priv[i]->bss_type == bss_type)
-			num++;
-	return num;
-}
-
 /*
  * This function returns the correct private structure pointer based
  * upon the BSS type and BSS number.