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mftransform: Fix deadlock when MFT requests processing output twice

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:fix-mft-deadlock into master 
This sequence of event/data flow might happen

1) Initially we have one pending output event
  1-1) Then, process the pending output data
2) No pending input event, then we should wait new pending input event
  2-1) Wakeup by new pending event (but it's pending output event)

In above case, MFT will not report new pending input event
if pending output is not processed.

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