Vorbis class doesn't properly return sample buffer fill

[segin]

Vorbis::getData() doesn't return how much of the buffer was actually filled with data; brief bursts of unexpected noise can be played at the very end of some Vorbis tracks.

Plus GCC chastises about it:

vorbis.cpp: In member function ‘virtual size_t Vorbis::getData(size_t, void*)’:
vorbis.cpp:86:1: warning: no return statement in function returning non-void [-Wreturn-type]                                                                                                                                                 
   86 | }                                                                                                                                                                                                                                       
      | ^