Check if the filedes of kevent is expected one. Though our

old resolver opened just one socket, BIND9's resolver may
open more than one sockets.  And, BIND9's resolver doesn't
close the socket on timeout.  So, we need this check.

Reported by:	freebsd-cvs-src__at__oldach.net (Helge Oldach), bz
Hinted by:	rwatson

lib/libc/resolv/res_send.c

@@ -970,6 +970,10 @@ send_dg(res_state statp,
 		res_nclose(statp);
 		return (0);
 	}
+#ifdef USE_KQUEUE
+	if (kv.ident != s)
+		goto wait;
+#endif
 	errno = 0;
 	fromlen = sizeof(from);
 	resplen = _recvfrom(s, (char*)ans, anssiz,0,