Removed harcoded 4MB buffer size on ESD

This resolves Bug 1485
(cherry picked from commit 0b9bcf1fcd)

flow/audioioesd.cc

@@ -204,14 +204,10 @@ int AudioIOESD::getParam(AudioParam p)
 		return write_fd;
 
 	case canRead:
-		return ESD_BUF_SIZE;
+		return param(fragmentSize);
 
 	case canWrite:
-		return ESD_BUF_SIZE;
-
-		// ESD handles are actually socket descriptors, and I know not
-		// of any portable way to peek at the socket's send or receive
-		// buffers.
+		return param(fragmentSize);
 
 	default:
 		return param(p);