zd1201: remove unused variable framelen

Variable framelen is assigned but never read, hence it is redundant
and can be removed. Cleans up clang warning:

drivers/net/wireless/zydas/zd1201.c:234:3: warning: Value stored
to 'framelen' is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/zydas/zd1201.c

@@ -230,8 +230,7 @@ static void zd1201_usbrx(struct urb *urb)
 	/* Info frame */
 	if (type == ZD1201_PACKET_INQUIRE) {
 		int i = 0;
-		unsigned short infotype, framelen, copylen;
-		framelen = le16_to_cpu(*(__le16*)&data[4]);
+		unsigned short infotype, copylen;
 		infotype = le16_to_cpu(*(__le16*)&data[6]);
 
 		if (infotype == ZD1201_INF_LINKSTATUS) {