[GFS2] print mount errors related to sysfs

Print an error message if mount fails in setting up the sysfs files.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/sys.c

@@ -555,6 +555,7 @@ int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 fail_reg:
 	kobject_unregister(&sdp->sd_kobj);
 fail:
+	fs_err(sdp, "error %d adding sysfs files", error);
 	return error;
 }