Fix truncation from double to float warning.

tests/teststops.cpp

@@ -63,7 +63,7 @@ int pulse( void *outputBuffer, void * /*inputBuffer*/, unsigned int nBufferFrame
   if ( status ) std::cout << "Stream over/underflow detected!" << std::endl;
 
   for ( i=0; i<nBufferFrames; i++ ) {
-    if ( data->frameCounter % data->pulseCount == 0 ) sample = 0.9;
+    if ( data->frameCounter % data->pulseCount == 0 ) sample = 0.9f;
     else sample = 0.0;
     for ( j=0; j<data->channels; j++ )
       *buffer++ = sample;