fix multiple calls to gpio_get_value() after switching to the cached file pointer -- need to seek to the start of the stream after every read

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1832 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -1,3 +1,9 @@
+2010-08-24  Mike Frysinger  <vapier@gentoo.org>
+
+  * src/tap/cable/gpio.c (gpio_get_value): Need to seek back to the start of
+    the gpio file after reading the value so we keep getting up-to-date
+    results as reported by Frans Meulenbroeks.
+
 2010-08-19  Mike Frysinger  <vapier@gentoo.org>
 
   * configure.ac, src/tap/cable_list.h, src/tap/cable/generic_usbconn_list.h,

urjtag/src/tap/cable/gpio.c

@@ -133,6 +133,7 @@ static int gpio_get_value (FILE *fp, unsigned int gpio)
     int value;
 
     ret = fscanf (fp, "%i", &value);
+    rewind (fp);
 
     if (ret != 1)
     {