AP_Radio: remove superfluous linefeed from panic strings

panic adds this within the HAL layer.

Author: peterbarker

libraries/AP_Radio/AP_Radio_bk2425.cpp

@@ -140,7 +140,7 @@ AP_Radio_beken::AP_Radio_beken(AP_Radio &_radio) :
 bool AP_Radio_beken::init(void)
 {
     if (_irq_handler_ctx != nullptr) {
-        AP_HAL::panic("AP_Radio_beken: double instantiation of irq_handler\n");
+        AP_HAL::panic("AP_Radio_beken: double instantiation of irq_handler");
     }
     chVTObjectInit(&timeout_vt);
     _irq_handler_ctx = chThdCreateFromHeap(NULL,

libraries/AP_Radio/AP_Radio_cc2500.cpp

@@ -85,7 +85,7 @@ bool AP_Radio_cc2500::init(void)
 {
 #if CONFIG_HAL_BOARD == HAL_BOARD_CHIBIOS
     if (_irq_handler_ctx != nullptr) {
-        AP_HAL::panic("AP_Radio_cc2500: double instantiation of irq_handler\n");
+        AP_HAL::panic("AP_Radio_cc2500: double instantiation of irq_handler");
     }
     chVTObjectInit(&timeout_vt);
     _irq_handler_ctx = chThdCreateFromHeap(NULL,

libraries/AP_Radio/AP_Radio_cypress.cpp

@@ -264,7 +264,7 @@ bool AP_Radio_cypress::init(void)
     dev = hal.spi->get_device(CYRF_SPI_DEVICE);
 #if CONFIG_HAL_BOARD == HAL_BOARD_CHIBIOS
     if (_irq_handler_ctx != nullptr) {
-        AP_HAL::panic("AP_Radio_cypress: double instantiation of irq_handler\n");
+        AP_HAL::panic("AP_Radio_cypress: double instantiation of irq_handler");
     }
     chVTObjectInit(&timeout_vt);
     _irq_handler_ctx = chThdCreateFromHeap(NULL,