src/share/grabbag/replaygain.c : Fix compiler warnings.
src/share/grabbag/replaygain.c : Fix compiler warnings.

Gcc 4.8 has a new warning about use of un-initialized data. In particular
this new warning can detect if an automatic variable is defined in one function
and then passed to another and used before it is initialized.

waitman/flac,fredericgermain/flac,waitman/flac,fredericgermain/flac,waitman/flac,waitman/flac,waitman/flac,fredericgermain/flac,fredericgermain/flac