gst/playback/gstdecodebin.c: When there is only one unfinished pad and it receives an event that doesn't match our re...

Original commit message from CVS:
* gst/playback/gstdecodebin.c: (remove_fakesink), (pad_probe):
When there is only one unfinished pad and it receives an event that
doesn't match our requirements, we need to set alldone=FALSE so that
the fakesink is not removed yet.