Some version of Mesa will claim the window system provided framebuffer is
incomplete when using indirect rendering, although the framebuffer objects
spec says this can never happen. Printing an ERR instead of crashing should
make it clearer that this isn't a wined3d problem.

Found by valgrind.

We use it to do a linear search of a binary tree, which is overkill.
Replace it with a simple binary search.

These fields are used to build a binary tree of elements in a storage. This
should make the usage clearer.

According to the MS spec, these are FILETIME structures containing creation
and modification times.