fix comment typos concerning "sequential"

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/include/linux/jffs2.h b/include/linux/jffs2.h
index 0874ab5..edb9231 100644
--- a/include/linux/jffs2.h
+++ b/include/linux/jffs2.h
@@ -185,7 +185,7 @@
 	jint32_t hdr_crc;
 	jint32_t ino;		/* inode number */
 	jint32_t xid;		/* XATTR identifier number */
-	jint32_t xseqno;	/* xref sequencial number */
+	jint32_t xseqno;	/* xref sequential number */
 	jint32_t node_crc;
 } __attribute__((packed));