OLA:  Fill extra output buffer with zeros
OLA:  Fill extra output buffer with zeros

Correct a bug in which output shorter than a full 512 channels sends
uninitialized data to the OLA server.  Now fills buffer with zero bytes
before copy.

mcallegari/qlcplus,plugz/qlcplus,plugz/qlcplus,mcallegari/qlcplus,joepadmiraal/qlcplus,joepadmiraal/qlcplus,plugz/qlcplus,nedmech/qlcplus,sbenejam/qlcplus,kripton/qlcplus,kripton/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus,joepadmiraal/qlcplus,mcallegari/qlcplus,nedmech/qlcplus,nedmech/qlcplus,kripton/qlcplus,joepadmiraal/qlcplus,nedmech/qlcplus,plugz/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,plugz/qlcplus,kripton/qlcplus,kripton/qlcplus,joepadmiraal/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,kripton/qlcplus,nedmech/qlcplus,kripton/qlcplus,plugz/qlcplus,sbenejam/qlcplus,nedmech/qlcplus,sbenejam/qlcplus,plugz/qlcplus,sbenejam/qlcplus,joepadmiraal/qlcplus