Use selected RTL-SDR device index#6
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The -d flag was parsed into sdrIndex, but rtlsdr.Open(0) always opened device 0. This caused the wrong RTL-SDR to be claimed when multiple dongles are attached.
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The -d flag is parsed into sdrIndex, supporting either a device serial number or device index, but the program still opened RTL-SDR device 0 unconditionally.
This caused the wrong RTL-SDR dongle to be claimed on systems with multiple RTL-SDR devices attached.
This change uses the parsed sdrIndex when opening the device.