Fix check for empty hostname.

As reported by Arthur Zakirov, Gcc 7.1 complained about this with
-Wpointer-compare.

Discussion: 
https://www.postgresql.org/message-id/CAKNkYnybV_NFVacGbW=vspzao3twrjfni+9ibob66yqqmzo...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4d06f1f858d0fea01a2cde74d8b831a823776355

Modified Files
--------------
src/interfaces/libpq/fe-connect.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)


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