Yama: remove an unused variable

GCC complains that we don't use "one" any more after 389da25f93 "Yama:
add additional ptrace scopes".

security/yama/yama_lsm.c:322:12: warning: ?one? defined but not used
	[-Wunused-variable]

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>

security/yama/yama_lsm.c

@@ -319,7 +319,6 @@ static int yama_dointvec_minmax(struct ctl_table *table, int write,
 }
 
 static int zero;
-static int one = 1;
 static int max_scope = YAMA_SCOPE_NO_ATTACH;
 
 struct ctl_path yama_sysctl_path[] = {