LMMS segfaults after changing the velocity of a note that has been pushed above B8.

How to reproduce:

1. Create two notes, one higher than the other.
2. Select both notes.
3. Drag bottom note all the way up until the top note is above B8.
4. Change velocity of the top note.

Notes can't be dragged below C0, but they can be dragged above B8 (which causes the problem).