IMF calls on Nigeria to lift foreign exchange curbs

By Ulf Laessing LAGOS (Reuters) - The International Monetary Fund (IMF) called on Wednesday for Nigeria to lift foreign exchange curbs and let the naira reflect "market forces" more closely, also urging more fiscal discipline and structural reform to bolster growth. President Muhammadu Buhari has rejected a naira devaluation and backed hefty restrictions imposed by the central bank to prevent a collapse of the naira as Africa's biggest economy is whacked by a slump in oil revenues, its lifeblood