Xiaomi Corp ’s quest to become the world’s largest smartphone vendor in three years hit a speed bump in the third quarter, as sales slowed because of the global semiconductor shortage and weak demand in China’s highly competitive handset market. “The [chip] shortage could result in fewer shipments of 10 million to 20 million units,” said Xiaomi president Wang Xiang in a conference call on Tuesday after the market closed. He estimated shipments this year would be about 190 million units, compared with the company’s earlier target of shipping 200 million smartphones . “For Xiaomi, the supply side problems are…