cleanup msvc 2005 build warnings

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12200 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/spandsp/src/lpc10_decode.c

@@ -68,7 +68,7 @@ static int32_t lpc10_random(lpc10_decode_state_t *s)
 
     /* The following is a 16 bit 2's complement addition,
        with overflow checking disabled */
-    s->y[s->k] += s->y[s->j];
+    s->y[s->k] = (int16_t)(s->y[s->k] + s->y[s->j]);
     ret_val = s->y[s->k];
     if (--s->k < 0)
         s->k = 4;