[JFFS2][XATTR] remove senseless comment

remove senseless comment.

[8/10] jffs2-xattr-v5.1-08-remove_senseless_comment.patch
Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>

fs/jffs2/xattr.h

@@ -38,7 +38,7 @@ struct jffs2_xattr_datum
 	uint32_t value_len;	/* length of xvalue */
 };
 
-struct jffs2_inode_cache;	/* forward refence */
+struct jffs2_inode_cache;
 struct jffs2_xattr_ref
 {
 	void *always_null;