spandsp trivial compiler warning - oops better do this instead

libs/spandsp/src/spandsp/saturated.h

@@ -369,7 +369,7 @@ static __inline__ int16_t saturated_mul16(int16_t a, int16_t b)
     if (product == 0x40000000)
         return INT16_MAX;
     /*endif*/
-    return (int16_t)product >> 15;
+    return (int16_t)(product >> 15);
 }
 /*- End of function --------------------------------------------------------*/