Qatar National Bank SAQ (QNBK)???s talks to acquire Denizbank AS (DENIZ), the Turkish lender put up for sale by Dexia SA (DEXB), are stalled over price and may collapse, people with knowledge of the process said.Dexia, which is being broken up after the European debt crisis reduced its ability to obtain funding, has reached out to other potential buyers, one of the people said, declining to be ide