Robin Gareus 1a288ddd95 Fix some more crashes at session-close
PortDrop unregisters backend ports, the backend will return a NULL
buffer-pointer, but the I/O object still exists (Metronome, LTC)

AudioBuffer::_data == 0

#0  msvcrt!memset () from C:\Windows\System32\msvcrt.dll
#1  ARDOUR::AudioBuffer::silence (this=0x2c410710, len=256, offset=0) at ../libs/ardour/audio_buffer.cc:88
#2  ARDOUR::AudioPort::cycle_end (this=0x34918730, nframes=256) at ../libs/ardour/audio_port.cc:66
#3  ARDOUR::PortManager::cycle_end (this=this@entry=0x23342770, nframes=nframes@entry=256)
[process callback w/o session]
2017-08-01 23:27:34 +02:00
2017-08-01 16:56:20 +02:00
2016-02-28 21:16:44 +01:00
2017-05-12 15:28:32 -07:00
2016-06-25 00:44:04 +02:00
2016-10-18 22:26:23 +02:00
2017-01-05 09:21:12 +00:00
2016-02-28 21:48:49 +01:00

Please see the Ardour web site at http://ardour.org/ for all documentation..

For information on building ardour: 
      
     http://ardour.org/development.html
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