Deleting buffer during file playback crashes Max

[rconstanzo]

Summary:
When you have a karma playing back from a buffer, if you delete that buffer, Max instantly crashes.

Steps to reproduce:
Create a karma/buffer pair and start file playback in karma. Select and delete the associated buffer (literally deleting the buffer~ object).

Actual results:
Max instantly crashes.

Expected results:
karma~ stops playback (similar to how groove~ responds to the same problem.

[rconstanzo]

Fixed with commit 3c6098d