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Fix unportable shell-script syntax in pg_upgrade's test.sh.
I discovered the hard way that on some old shells, the locution FOO="" unset FOOdoes not behave the same as FOO=""; unset FOOand in fact leaves FOO set to an empty string. test.sh was inconsistentlyspelling it different ways on adjacent lines.This got broken relatively recently, in commitc737a2e, so the lack offield reports to date doesn't represent a lot of evidence that the problemis rare.1 parent37e5b3d commita98ad4f
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