vbo: simplify vbo_save_NotifyBegin()
This function always returned GL_TRUE. Just make it a void function.
Remove unreachable code following the call to vbo_save_NotifyBegin()
in save_Begin() in dlist.c
There were some stale comments that no longer applied since an earlier
code refactoring.
No Piglit regressions.
Reviewed-by:
Charmaine Lee <charmainel@vmware.com>