[xmp] bug in oktalyzer player

[Andreas A. <an...@bl...>]

Using libxmp 4.2.3 (+Chiptracker patch):

The attached Oktalyzer songs have some channels silent.

necronom-4.okta is totally silent in the beginning, the two playing 
channels are silent.
never ending story ii-5.okta channel 3 is silent in the beginning.

Tried them in Oktalyzer 1.57 on WinUAE and the play fine there.

Best regards,
Andreas Argirakis