dsound primary.c fix

Robert Reif reif at earthlink.net
Tue Apr 1 18:34:47 CST 2003

This patch fixes a problem where the wave handle
could be used when it is NULL.

This shouldn't be a problem in normal practice but
is encountered when closing and immediately opening
another sound device.  Waiting a while before opening
another device or opening it again after failure works
but the real cause of the problem is unknown.  At least
with this patch, the program won't crash.
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