[PATCH] taglib: fix parsing of MPEG properties

[Gregory Petrosyan]

Attached patch fixes parsing of some MPEG files.

Bug description: in MPEG::Properties::read(), lastFrameOffset() can
return near-eof pos (e.g., eof - 2, for file ending with 0xff 0xf8), and after

Header lastHeader(d->file->readBlock(4));

no more reads from file can be done, so call to
MPEG::File::nextFrameOffset() in
MPEG::File::firstFrameOffset() will return -1, because,
after initial read, buffer will still be empty.

--
Regards, Gregory.
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