wireguard: queueing: do not account for pfmemalloc when clearing skb header

Before 8b700862 ("net: Don't copy pfmemalloc flag in __copy_skb_
header()"), the pfmemalloc flag used to be between headers_start and
headers_end, which is a region we clear when preparing the packet for
encryption/decryption. This is a parameter we certainly want to
preserve, which is why 8b700862 moved it out of there. The code here
was written in a world before 8b700862, though, where we had to
manually account for it. This commit brings things up to speed.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wireguard/queueing.h

@@ -83,13 +83,10 @@ static inline __be16 wg_skb_examine_untrusted_ip_hdr(struct sk_buff *skb)
 
 static inline void wg_reset_packet(struct sk_buff *skb)
 {
-	const int pfmemalloc = skb->pfmemalloc;
-
 	skb_scrub_packet(skb, true);
 	memset(&skb->headers_start, 0,
 	       offsetof(struct sk_buff, headers_end) -
 		       offsetof(struct sk_buff, headers_start));
-	skb->pfmemalloc = pfmemalloc;
 	skb->queue_mapping = 0;
 	skb->nohdr = 0;
 	skb->peeked = 0;