Memory leak in MASA spherical indexing structure use in encoding

Basic info

Bug description

A new spherical indexing structure for mapping azimuth and elevation to spherical indices (needed for the case of 512 kbps metadata encoding) is created when the metadata framing adjustment in MASA is activated, and the structure is never freed leading to a memory leak. The creation of the new structure and the memory leak can be avoided by using the existing indexing structure from hMasa encoder structure instead.