(Reuters) – Sales at Qualcomm Inc are slowing as the smartphone market heads for its worst contraction in years, and Wall Street analysts don’t expect that to turn around anytime soon. At least 14 brokerages lowered their price targets on the largest maker of smartphone chips on Thursday after it gave a forecast $2 billion below market estimates and said it had extra inventory that could take half a year to clear. Qualcomm shares, which have already lost more than a third of their value this year, fell 6.6% in afternoon trading. “We believe a weak market, and even a potential inventory correct…