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Opening the serial port(s) returns -1 when it fails, check that the number of file descriptors is greater than 0 and less than the size of the array. Test: VtsHalBluetoothV1_0TargetTest, Bluetooth start/stop Bug: 64420262 Change-Id: Icbffa5bd8c02030e389bac03aa5e1e78cc3c6057