Prepare for changing audio_pcm_ops dynamically (partially revert r5422)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5435 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/audio/paaudio.c b/audio/paaudio.c
index be9ebae..8190cde 100644
--- a/audio/paaudio.c
+++ b/audio/paaudio.c
@@ -487,7 +487,7 @@
     {NULL, 0, NULL, NULL, NULL, 0}
 };
 
-static const struct audio_pcm_ops qpa_pcm_ops = {
+static struct audio_pcm_ops qpa_pcm_ops = {
     qpa_init_out,
     qpa_fini_out,
     qpa_run_out,