mwifiex: Removed unused mwifiex_private* 'priv' variable

Commit bec568ff removed the last remaining usage of struct
mwifiex_private* priv in mwifiex_fw_dpc(), by removing the call to
mwifiex_del_virtual_intf().
Compiling mwifiex/ with W=1 gives the following warning, fix it.
mwifiex/main.c: In function ‘mwifiex_fw_dpc’:
mwifiex/main.c:520:26: warning: variable ‘priv’ set but not used [-Wunused-but-set-variable]

Fixes: bec568ff ("mwifiex: failure path handling in mwifiex_add_virtual_intf()")
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -518,7 +518,6 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 {
 	int ret;
 	char fmt[64];
-	struct mwifiex_private *priv;
 	struct mwifiex_adapter *adapter = context;
 	struct mwifiex_fw_image fw;
 	bool init_failed = false;
@@ -576,8 +575,6 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 			goto err_init_fw;
 	}
 
-	priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
-
 	if (!adapter->wiphy) {
 		if (mwifiex_register_cfg80211(adapter)) {
 			mwifiex_dbg(adapter, ERROR,