Fix copy-and-past thinko (src/interfaces/libpq/fe-cancel.c)

[Ranier Vilela]

Hi.

In the function *PQcancelCreate* there is a copy-and-past thinko.
The pointer that must be checked is cancelConn.

Trivial patch attached.

best regards,
Ranier Vilela

fix-copy-and-past-thinko-fe-cancel.patch
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