Venezuela’s opposition is getting ready to file within days a lawsuit in the United States seeking to prevent bond holders of Venezuelan state oil firm PDVSA from going after shares in its U.S. subsidiary Citgo over an expected PDVSA bond default this month, Reuters reports, citing three sources familiar with the matter. PDVSA has to make a payment of US$913 million on the 2020 bond in late October, but the bond is widely expected to go into default because the Venezuelan oil firm doesn’t have the money to make the payment. PDVSA, however,…