Joerg Wunsch 06e999b8c5 Check whether serial_serno is not NULL before calling it. ...

For devices connected through a real serial device rather than
USB, there is no transport-layer serial number available.

stk500v2.c (and jtag3.c) tried to always call this function.

Closes #1254

2023-01-01 22:23:44 +01:00

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