reiserfsprogs: use com_err in reiserfs_open

We dump failure messages to the terminal regardless of whether the caller
wants them or not.  This can be annoying when used as part of a general
tool that tests to see which file system is on a device by calling
its open routine.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

reiserfscore/includes.h

@@ -10,6 +10,7 @@
 #include "io.h"
 #include "misc.h"
 #include "reiserfs_lib.h"
+#include "reiserfs_err.h"
 
 #include <string.h>
 #include <stdlib.h>