Backport of "pad: Don't leak user_data in gst_pad_start_task" into 1.22
Backport of !3920 (merged) "pad: Don't leak user_data in gst_pad_start_task".
Commits:
- aeb262a7 pad: Don't leak user_data in gst_pad_start_task
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Backport of !3920 (merged) "pad: Don't leak user_data in gst_pad_start_task".
Commits: