don't subtract from p->to_recv

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1299 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/ChangeLog

@@ -1,3 +1,9 @@
+2008-07-09  Arnim Laeuger  <arniml@users.sourceforge.net>
+
+   * src/tap/usbconn/libftd2xx.c (usbconn_ftd2xx_write),
+     src/tap/usbconn/libftdi.c (usbconn_ftdi_write): don't subtract from
+     p->to_recv
+
 2008-07-03  Mike Frysinger  <vapier@gentoo.org>
 
    * src/lib/ansidecl.h, src/lib/libiberty.h: Import headers from binutils

jtag/src/tap/usbconn/libftd2xx.c

@@ -204,7 +204,8 @@ usbconn_ftd2xx_write( usbconn_t *conn, uint8_t *buf, int len, int recv )
   {
     memcpy( &(p->send_buf[p->send_buffered]), buf, len );
     p->send_buffered += len;
-    p->to_recv       += recv;
+    if (recv > 0)
+      p->to_recv     += recv;
 
     if (recv < 0)
     {

jtag/src/tap/usbconn/libftdi.c

@@ -203,7 +203,8 @@ usbconn_ftdi_write( usbconn_t *conn, uint8_t *buf, int len, int recv )
   {
     memcpy( &(p->send_buf[p->send_buffered]), buf, len );
     p->send_buffered += len;
-    p->to_recv       += recv;
+    if (recv > 0)
+      p->to_recv     += recv;
 
     if (recv < 0)
     {