Fix tests run with make check when using alternative allocators.
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The call to free in line 584 of sharedbook.c mismatches the _ogg_calloc call used to allocated that data in line 216.
This causes make check to fail when alternative allocators are used, e.g. the xmm_malloc family of allocators used with the Lancer optimizations.
Signed-off-by: Ralph Giles giles@thaumas.net