Bug#798248: Patch to fix FTBFS on Alpha

[Michael Cree]

Control: tags -1 + patch

Here goes a patch to fix the FTBFS on Alpha.  It protects the
floating point addition of volumes in dB from adding any infinities.
An assumption is made that negative infinity is the only possible
non-finite number since dB are calculated via a logarithm from
volumes and volumes are necessarily non-negative.

Cheers
Michael.
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