Apply suggestion from @weebl2000

Co-authored-by: Wessel <wessel@weebl.me>

variants/muziworks_r1_neo/target.cpp

@@ -37,7 +37,7 @@ void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
   radio.setCodingRate(cr);
 }
 
-void radio_set_tx_power(uint8_t dbm) {
+void radio_set_tx_power(int8_t dbm) {
   radio.setOutputPower(dbm);
 }