lwip: dns: Remove always true test in dns_alloc_random_port
lwip: dns: Remove always true test in dns_alloc_random_port

Upstream commit: 6e863ecb50a319c5793c268c8600719a072d172e

johnkingsley/aprinter,ambrop72/aprinter,johnkingsley/aprinter,ambrop72/aprinter,johnkingsley/aprinter,johnkingsley/aprinter,ambrop72/aprinter,johnkingsley/aprinter,ambrop72/aprinter,ambrop72/aprinter,ambrop72/aprinter,johnkingsley/aprinter,ambrop72/aprinter,johnkingsley/aprinter