[swfmill] [patch] fix some bad manners.

[INADA Naoki]

Please apply one more patch.

This patch fixes:
 - saveXML() leaks xmlDoc
 - using delete for memory allocated by new[]
 - using delete[] for xmlDocDumpFormatMemory output.
 - unnecessary check "if (x) delete x;" ("delete 0" is safe)

No more memory handling error in SWFFile, I think.

---
Sorry about my poor English.
INADA Naoki  <inada-n at klab.org>
                    KLab Inc.
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