Add battery voltage that is now exported from the power management as a wps tag

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8454 a1c6a512-1295-4272-9138-f99709370657

apps/gui/gwps-common.c

@@ -639,11 +639,22 @@ static char* get_tag(struct wps_data* wps_data,
                     else
                     {
                         *intval = 6;
-                        return "?%";
+                        return "?";
                     }
                     return buf;
                 }
 
+                case 'v': /* battery voltage */
+                {
+                    int v = battery_voltage();
+                    if (v > -1)
+                    {
+                        snprintf(buf, buf_size, "%d.%02d", v/100, v%100);
+                        return buf;
+                    } else
+                        return "?";
+                }
+
                 case 't': /* estimated battery time */
                 {
                     int t = battery_time();