wifi: rt2x00: simplify rt2x00crypto_rx_insert_iv()

In 'rt2x00crypto_rx_insert_iv()', added alignment can't exceed 3
bytes and ICV size is either 4 or 8 bytes, so skb space adjustment
may be simplified. Compile tested only.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231019070750.17911-1-dmantipov@yandex.ru

drivers/net/wireless/ralink/rt2x00/rt2x00crypto.c

@@ -197,10 +197,7 @@ void rt2x00crypto_rx_insert_iv(struct sk_buff *skb,
 		transfer += header_length;
 	} else {
 		skb_push(skb, iv_len + align);
-		if (align < icv_len)
-			skb_put(skb, icv_len - align);
-		else if (align > icv_len)
-			skb_trim(skb, rxdesc->size + iv_len + icv_len);
+		skb_put(skb, icv_len - align);
 
 		/* Move ieee80211 header */
 		memmove(skb->data + transfer,