dsound: Don't deadlock in capture because of callback

[Maarten Lankhorst]

Doing the capture tests for alsa (dsound emulation) I came across an
interesting deadlock:

GetCurrentPosition obtains critsect and calls widGetPosition.
widGetPosition is blocked by the capture callback.
capture callback tries to obtain critsect.

The lock isn't really needed at that place so I'm moving it a little.
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