Stop saying we'll try compression later, if it is later.

On the post-userauth rekey, when we're specifically rekeying in order
to turn on delayed compression, we shouldn't write the Event Log
"Server supports delayed compression; will try this later" message
that we did in the original key exchange. At this point, it _is_
later, and we're about to turn on compression right now!

ssh.c

@@ -5731,7 +5731,8 @@ static void do_ssh2_transport(void *vctx)
 		}
 		if ((i == KEXLIST_CSCOMP || i == KEXLIST_SCCOMP) &&
 		    in_commasep_string(alg->u.comp->delayed_name,
-                                       str.ptr, str.len))
+                                       str.ptr, str.len) &&
+                    !s->userauth_succeeded)
 		    s->pending_compression = TRUE;  /* try this later */
 	    }
 	    bombout(("Couldn't agree a %s (available: %.*s)",