Clearing buffer index and length of codec2 data when the reproduction of a voice prompt is completed

openrtx/src/core/voicePrompts.c

@@ -497,6 +497,8 @@ void vp_tick()
     {
         voicePromptActive              = false;
         vpCurrentSequence.pos          = 0;
+        vpCurrentSequence.c2DataIndex  = 0;
+        vpCurrentSequence.c2DataLength = 0;
     }
 }