more precise using PIIODevice::reading_now flag, Warning! one should use it manually now

small enum fix for pip_cmg

libs/main/io_devices/pifile.cpp

@@ -439,7 +439,10 @@ PIByteArray PIFile::get() {
 
 ssize_t PIFile::readDevice(void * read_to, ssize_t max_size) {
 	if (!canRead() || PRIVATE->fd == 0) return -1;
-	return fread(read_to, 1, max_size, PRIVATE->fd);
+	reading_now = true;
+	ssize_t ret = fread(read_to, 1, max_size, PRIVATE->fd);
+	reading_now = false;
+	return ret;
 }