It was not setting the value _back_ to 0 when the function ended
and this caused qtbug68821proxyError to fail fairly consistently
on Windows when it was running in the same run.
qtbug68821proxyError was always succeeding when ran by itself so
it was quite odd.
Pick-to: 6.7
Change-Id: Ifa4982f1b10128674081136a30bdab4b0ce7004a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>
5e102a792c