Fix up null delegate use in goto exit pattern in TV clusters

[andy31415]

Problem

#20682 fixes some potential segfaults in the media input server. Looking at the original #13259 it looks like the same pattern exists in other files (notably I see audio-output-server.cpp being also broken).

Proposed Solution

After a verify that it is not null check, the null delegate should not be dereferenced. the code after exit should only do cleanup.