Fix possible dereference null pointer (PQprint)

[Ranier Vilela]

Hi.

In the function *PQprint*, the variable po->fieldName
can be NULL.
See the checks a few lines up.

for (numFieldName = 0;
po->fieldName && po->fieldName[numFieldName];
numFieldName++)

So, I think that must be checked, when used,
in the loop below.

best regards,
Ranier Vilela

fix-possible-dereference-null-pointer-PQprint.patch
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