Backport of "appsrc: Don't leak buffer list while wrongly unreffing buffer on EOS/flushing" into 1.18
Backport of !1134 (merged) "appsrc: Don't leak buffer list while wrongly unreffing buffer on EOS/flushing".
Commits:
Backport of !1134 (merged) "appsrc: Don't leak buffer list while wrongly unreffing buffer on EOS/flushing".
Commits: