Fix thinkos from 4f4061b for libpq integer parsing

A check was redundant.  While on it, add an assertion to make sure that
the parsing routine is never called with a NULL input.  All the code
paths currently calling the parsing routine are careful with NULL inputs
already, but future callers may forget that.

Reported-by: Peter Eisentraut, Lars Kanis
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 12

Branch
------
REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/a6a95d4f382b67bc80b63e4769dfb240bafd9aa7

Modified Files
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src/interfaces/libpq/fe-connect.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

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