net: openvswitch: Use ERR_CAST() to return

Using ERR_CAST() is more reasonable and safer, When it is necessary
to convert the type of an error pointer and return it.
Signed-off-by: Yan Zhen <yanzhen@vivo.com>
Acked-by: Eelco Chaudron <echaudro@redhat.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://patch.msgid.link/20240829095509.3151987-1-yanzhen@vivo.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/openvswitch/flow_netlink.c

@@ -2491,7 +2491,7 @@ static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
 
 	acts = nla_alloc_flow_actions(new_acts_size);
 	if (IS_ERR(acts))
-		return (void *)acts;
+		return ERR_CAST(acts);
 
 	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
 	acts->actions_len = (*sfa)->actions_len;