dsound: Replace a realloc-or-alloc with a free-then-alloc.

[Ken Thomases]

The buffer is to be overwritten anyway, so there's no need to preserve its
contents.  Also, the old code leaked if the realloc were to fail.  All in all,
free-then-alloc is simpler.
---
  dlls/dsound/buffer.c |    7 ++-----
  1 files changed, 2 insertions(+), 5 deletions(-)


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