staging: lustre: cl_page: fix a typo in comments

We want to "sever" all the ways to get a new pointer to "pg".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/cl_page.c

@@ -667,7 +667,7 @@ static void cl_page_delete0(const struct lu_env *env, struct cl_page *pg)
 	PASSERT(env, pg, pg->cp_state != CPS_FREEING);
 
 	/*
-	 * Severe all ways to obtain new pointers to @pg.
+	 * Sever all ways to obtain new pointers to @pg.
 	 */
 	cl_page_owner_clear(pg);