[FreeNX-kNX] CreatePixmap bounds check from mainline patch

[Mario Becroft]

While diagnosing the pixmap leak I posted about recently, I noticed that
the nxagent ProcCreatePixmap() is missing a bounds check present in the
same version dix/dispatch.c ProcCreatePixmap(). It looks like without
this check, a client that allocates a too-large pixmap could crash or
corrupt the server. Therefore I have ported it to the nxagent
ProcCreatePixmap() in nxagent/NXdispatch.c. I suggest the following
patch be added to nx.

createpixmap_bounds_check.patch

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-- 
Mario Becroft <mb at gem.win.co.nz>