Fix small copy-paste typo in ossaudiodev setparameters() example (found by Ken Housley on docs@).
diff --git a/Doc/library/ossaudiodev.rst b/Doc/library/ossaudiodev.rst
index 3002700..4a0c3a3 100644
--- a/Doc/library/ossaudiodev.rst
+++ b/Doc/library/ossaudiodev.rst
@@ -302,7 +302,7 @@
 
       fmt = dsp.setfmt(fmt)
       channels = dsp.channels(channels)
-      rate = dsp.rate(channels)
+      rate = dsp.rate(rate)
 
 
 .. method:: oss_audio_device.bufsize()