psql: Fix incorrect equality comparison
Commit
1a759c83278 contained an incorrect equality comparison
which was discovered by Coverity.
Reported-by: Ranier Vilela <ranier.vf@gmail.com>
Discussion: https://postgr.es/m/CAEudQApfAWzLo+oSuy2byXktdr7R8KJC_ACT5VV8fontrL35Pw@mail.gmail.com