Patch to fix call to ov_read

[Sandro Tosi]

Hello,

I've got a report[1] in Debian about a crash in pyvorbis trying to call the read() method. The code to replicate the problem is as follow:

>>> import ogg.vorbis

>>> file = ogg.vorbis.VorbisFile('song.ogg')

>>> (data, bytes, bit) = file.read(4096)

Floating point exception

[1] http://bugs.debian.org/696640

A patch is available at [2] and also I'm attaching the one I'm about to apply to the Debian package here.

[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=670062#10

Regards,

Sandro