(player_new): Proper error checking. Oops, now it may return NULL.

Proper error checking in callers required.
(update_wait, market_update): If player_new() returns null pointer,
skip update.
(player_accept): If player_new() returns null pointer, close
connection.

src/server/update.c

@@ -142,6 +142,10 @@ void *argv;
 	 * in the land so it can finish before it yields.
 	 */
 	dp = player_new(0, 0);
+	if (!dp) {
+	    logerror("can't create dummy player for update");
+	    continue;
+	}
 	stacksize = 100000 +
 /* finish_sects */ WORLD_X * WORLD_Y * (2 * sizeof(double) +
 					sizeof(s_char *));