Guillaume Gonnet f5c9fef096 pkg/semtech_loramac: fix DEBUG message when payload is NULL
In function `_semtech_loramac_send` parameter `payload` can be NULL (that the
case when scheduling an immediate TX, line 726). As DEBUG macro use printf,
a %s parameter can't be NULL so we have to handle that case.
2019-05-15 20:50:55 +02:00
..
2018-09-25 22:22:13 +02:00