bpf: specify handle_lxc_traffic return type to fix -Wimplicit-int error
bpf: specify handle_lxc_traffic return type to fix -Wimplicit-int error

This fixes the following error when building with clang 15:

    bpf_host.c:1414:1: error: type specifier missing, defaults to 'int' [-Werror,-Wimplicit-int]
    handle_lxc_traffic(struct __ctx_buff *ctx)
    ^
    1 error generated.

Fixes: a4aac43d1ed7 ("bpf: Support hostfw with endpoint routes")

Signed-off-by: Tobias Klauser <059b8b880f8441509ec8a65b50b4c6ae74ebea76@cilium.io>

michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,cilium/cilium