wireguard: peer: Replace sockaddr with sockaddr_inet

As part of the removal of the variably-sized sockaddr for kernel
internals, replace struct sockaddr with sockaddr_inet in the endpoint
union.

No binary changes; the union size remains unchanged due to sockaddr_inet
matching the size of sockaddr_in6.

Signed-off-by: Kees Cook <kees@kernel.org>
Link: https://patch.msgid.link/20250722171836.1078436-2-kees@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kees

drivers/net/wireguard/peer.h

@@ -20,7 +20,7 @@ struct wg_device;
 
 struct endpoint {
 	union {
-		struct sockaddr addr;
+		struct sockaddr_inet addr;     /* Large enough for both address families */
 		struct sockaddr_in addr4;
 		struct sockaddr_in6 addr6;
 	};