Tiled File Descriptor Leak

[Steve Wormley]

I had a minor issue where I loaded a new(large) tiled dataset into mapserver
(using PHP/Mapscript to view) and after a few iterations the web server ran
out of file descriptors.

I don't claim to understand how the code works, but the attached patch
appears to have fixed most of the issue.

-Steve Wormley

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