In PQsendQueryStart(), avoid leaking any left-over async result.
authorTom Lane
Mon, 10 Oct 2016 14:35:58 +0000 (10:35 -0400)
committerTom Lane
Mon, 10 Oct 2016 14:35:58 +0000 (10:35 -0400)
commiteb6bc03bfb43a11e15c2e24d9f6069add284f930
treec2add43b07e0a7f375f3472c5494f9fdc615dbfa
parent12230c47855f67d1288c058d8d0a5f8e1febe366
In PQsendQueryStart(), avoid leaking any left-over async result.

Ordinarily there would not be an async result sitting around at this
point, but it appears that in corner cases there can be.  Considering
all the work we're about to launch, it's hardly going to cost anything
noticeable to check.

It's been like this forever, so back-patch to all supported branches.

Report: 
src/interfaces/libpq/fe-exec.c