Buy or sell stocks, Sept. 30 -- The key benchmark indices of the Indian stock market ended flat after a volatile, range-bound session on September 29, with the Nifty posting its seventh straight decline. After a positive start, the market attempted an early upside, but persistent selling on intraday rallies dragged the Nifty to close near the day's low. Uncertainty surrounding the US-India trade deal and sustained weakness in the IT and pharmaceutical sectors remain key near-term headwinds for the market. Investors are awaiting the RBI policy announcement this week, with the central bank widely expected to maintain the status quo on rates. At close, the Sensex was down 61.52 points or 0.08 per cent at 80,364.94, and the Nifty was down 19....