xfrm6_tunnel: Fix spi check in __xfrm6_tunnel_alloc_spi

xfrm6_tunnel: Fix spi check in __xfrm6_tunnel_alloc_spi

[ Upstream commit fa89a4593b927b3f59c3b69379f31d3b22272e4e ]

gcc warn this:

net/ipv6/xfrm6_tunnel.c:143 __xfrm6_tunnel_alloc_spi() warn:
 always true condition '(spi <= 4294967295) => (0-u32max <= u32max)'

'spi' is u32, which always not greater than XFRM6_TUNNEL_SPI_MAX
because of wrap around. So the second forloop will never reach.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>