caddyesi: bufferedWriter.Write refactor big if block
caddyesi: bufferedWriter.Write refactor big if block

Does not change the logic but returns now early.

corestoreio/caddy-esi,corestoreio/caddy-esi,corestoreio/caddy-esi,SchumacherFM/caddyesi,SchumacherFM/caddyesi,SchumacherFM/caddyesi