[GFS2] vfree should be kfree

This was missed in an earlier patch when changing over from vmalloc
to kmalloc for the superblock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_fstype.c

@@ -769,7 +769,7 @@ fail_lm:
 fail_sys:
 	gfs2_sys_fs_del(sdp);
 fail:
-	vfree(sdp);
+	kfree(sdp);
 	sb->s_fs_info = NULL;
 	return error;
 }