[PATCH] drmStrdup doesn't check for failed allocation

[Tilman S. <ti...@co...>]

Hi,
drmStrdup() doesn't check for an allocation failure. I attached a patch
that also tries to improve readability of the code. Feel free to
disagree on that :)

I realize the chances of drmStrdup() failing are probably low, but it
should be corrected anyway.

Regards,
Tilman