--- a/usr/src/grub/grub-0.97/stage2/disk_io.c	Thu Jul 30 16:15:07 2009 +0100
+++ b/usr/src/grub/grub-0.97/stage2/disk_io.c	Thu Jul 30 09:40:30 2009 -0600
@@ -431,8 +431,15 @@
 {
 #ifndef STAGE1_5
   for (fsys_type = 0; fsys_type < NUM_FSYS; fsys_type++)
+  {
+    /*
+     * (re)set errnum to 0 in order to clear any state that may have
+     * been left from a previous mount (or other) routine.
+     */
+    errnum = 0;
     if ((fsys_table[fsys_type].mount_func) ())
       break;
+  }
 
   if (fsys_type == NUM_FSYS && errnum == ERR_NONE)
     errnum = ERR_FSYS_MOUNT;