Backport of "gstreamer: bin: Don't unlock unlocked mutex in gst_bin_remove_func()" into 1.22
Backport of !3903 (merged) "gstreamer: bin: Don't unlock unlocked mutex in gst_bin_remove_func()".
Commits:
- 3943503f gstreamer: bin: Don't unlock unlocked mutex in gst_bin_remove_func()