Delete buffer data when removing it from the SharedGroup namespace

Updating or deleting data associated with a buffer object was clearing
the name->data association, but not actually deallocating the data.

Thanks to manjian2006 for finding the bug and proposing the fix.

Bug: 60468
Change-Id: Ibabfb1bace8acdeb1a4bbe5bf922845d096a8d22
1 file changed