simplify ubertooth-dfu variable in firmware build

greatscottgadgets / ubertooth

Software, firmware, and hardware designs for Ubertooth

https://greatscottgadgets.com/ubertoothone/

GNU General Public License v2.0

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Open mossmann opened 2 years ago

mossmann commented 2 years ago

This results in a clearer error message if ubertooth-dfu is not found.