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sunaudio: fix input buffer overrun

The write loop should use the remaining input size, not the initial
value.

--- a/src/sunaudio.c

+++ b/src/sunaudio.c

@@ -443,7 +443,7 @@

         size_t cbStride;

         int cbWritten;

-        cStride = cInput;

+        cStride = cInputRemaining;

         if (cStride > pPriv->cOutput) {

             cStride = pPriv->cOutput;

         }