drop useless field

was probably added to distinguish between AF_INET and AF_INET6, to use
different functions for logging.  But it wasn't really used, and now
we use getnameinfo anyway.

gmid.h

@@ -106,7 +106,6 @@ struct client {
 	char		 sbuf[1024];	  /* static buffer */
 	void		*buf, *i;	  /* mmap buffer */
 	ssize_t		 len, off;	  /* mmap/static buffer  */
-	int		 af;
 	struct sockaddr_storage	 addr;
 	struct vhost	*host;	/* host she's talking to */
 };

server.c

@@ -531,7 +531,6 @@ do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
 			clients[i].child = 0;
 			clients[i].waiting_on_child = 0;
 			clients[i].buf = MAP_FAILED;
-			clients[i].af = AF_INET;
 			clients[i].addr = addr;
 
 			connected_clients++;