Now calloc the buffer when playing non-interleaved audio instead of malloc,...

Commit by leighsmith :: r3643 /trunk/MusicKit/Frameworks/ (3 files in 2 dirs): (link) Now calloc the buffer when playing non-interleaved audio instead of malloc, since under heavy load the SndStreamManager processStreamAtTime method can be called without any clients and simply hand back the buffer to play without modification. Calloc ensures it's silence in this case.