[usbtunerhelper] fix pump_proc exit issue.

[vuplus_openvuplus_3.0] / meta-openvuplus / recipes-vuplus / usbtunerhelper / usbtunerhelper / pump_proc_checksize.patch

diff --git a/usbtunerhelper.c b/usbtunerhelper.c
index e7abc22..ae000de 100644
--- a/usbtunerhelper.c
+++ b/usbtunerhelper.c
@@ -263,7 +263,7 @@ void *pump_proc(void *ptr)
                if (_select(adapter->demux + 1, &rset, NULL, NULL, &tv) > 0)
                {
                        int size = _read(adapter->demux, adapter->buffer, BUFFER_SIZE);
-                       if (_writeall(adapter->vtuner, adapter->buffer, size) <= 0)
+                       if (size > 0 && _writeall(adapter->vtuner, adapter->buffer, size) <= 0)
                        {
                                break;
                        }