PIIODevice::readForTime fix

libs/main/io_devices/piiodevice.cpp

@@ -379,6 +379,7 @@ PIByteArray PIIODevice::readForTime(double timeout_ms) {
 	if (timeout_ms <= 0.) return str;
 	ssize_t ret;
 	uchar * td  = new uchar[threaded_read_buffer_size];
+	bool was_br = setOption(BlockingRead, false);
 	tm.reset();
 	while (tm.elapsed_m() < timeout_ms) {
 		ret = read(td, threaded_read_buffer_size);
@@ -387,6 +388,7 @@ PIByteArray PIIODevice::readForTime(double timeout_ms) {
 		else
 			str.append(td, ret);
 	}
+	setOption(BlockingRead, was_br);
 	delete[] td;
 	return str;
 }