hints for the code analysis.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7653 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/voipcodecs/src/oki_adpcm.c

@@ -276,6 +276,10 @@ int oki_adpcm_decode(oki_adpcm_state_t *s,
     int samples;
     float z;
 
+#if (_MSC_VER >= 1400) 
+	__analysis_assume(s->phase >=0 && s->phase <= 4);
+#endif
+
     samples = 0;
     if (s->bit_rate == 32000)
     {