[winealsa.drv] Improve midi port names (try 2)

[Christian Costa]

Hi,

This time, when only the port name is used, make it fit in the device 
name array.
This fixes bug 13241.

Bye,
Christian

Changelog:
Improve midi port names by using both client and port names when 
possible and port name only otherwise.

Christian Costa   titan.costa at wanadoo.fr
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