File use_ferror.diff of Package grub

Fread doesn't return -1 on error, so use ferror().

--- util/mbchk.c.old	Tue Jan 22 18:36:17 2002
+++ util/mbchk.c	Tue Jan 22 18:28:54 2002
@@ -59,7 +59,9 @@ check_multiboot (const char *filename, F
   int i;
   char buf[8192];
 
-  if (fread (buf, 1, 8192, fp) < 0)
+  fread (buf, 1, 8192, fp);
+  
+  if (ferror(fp))
     {
       fprintf (stderr, "%s: Read error.\n", filename);
       return 0;