xfrm: use correct size to initialise sp->ovec

xfrm: use correct size to initialise sp->ovec

BugLink: https://bugs.launchpad.net/bugs/1854216
[ Upstream commit f1193e915748291fb205a908db33bd3debece6e2 ]

This place should want to initialize array, not a element,
so it should be sizeof(array) instead of sizeof(element)

but now this array only has one element, so no error in
this condition that XFRM_MAX_OFFLOAD_DEPTH is 1

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>