Comment 23 for bug 324465

Reopening because Jared sent me an expanded patch from my earlier one which will catch a lot more of these MIPOINTER nullptr errors.

I've uploaded this patch to Jaunty and would like to see it go in for beta, since it may solve a lot of the -nvidia crashes we're seeing with multi-screen setups. Since this is all null pointer checks and error messages, I think it should be quite safe. Anyplace where the null pointer is returned from MIPOINTER(), it's used in a manner that would result in a segfault crash, so I'm pretty certain this change can't cause regressions.