revenge of CALLOC_STRUCT

[Dave Airlie]

Hey,

Happy holidays, and as though to consider over the break,

We have the vmware used MALLOC/FREE/CALLOC/CALLOC_STRUCT wrappers used
throughout gallium.

We have ST_CALLOC_STRUCT in use in the mesa state tracker, not used in gallium.

Merging the state tracker into mesa proper, and even prior to this a
few CALLOC_STRUCT have started to leak into src/mesa/*.

Now I don't think we want that, but CALLOC_STRUCT is a genuinely
useful macro on it's own,
I'm considering just defined a calloc_struct instead for the
non-gallium use that goes with malloc/calloc/free.

Any opinions, or should mesa just get u_memory.h support for Xmas?

Dave.