HAL_ChibiOS: make not having bus lock a soft error

this is nicer for driver developers

libraries/AP_HAL_ChibiOS/I2CDevice.cpp

@@ -160,7 +160,7 @@ bool I2CDevice::transfer(const uint8_t *send, uint32_t send_len,
                          uint8_t *recv, uint32_t recv_len)
 {
     if (!bus.semaphore.check_owner()) {
-        hal.console->printf("ERR: I2C transfer by non-owner\n");
+        hal.console->printf("I2C: not owner of 0x%x\n", (unsigned)get_bus_id());
         return false;
     }
     

libraries/AP_HAL_ChibiOS/SPIDevice.cpp

@@ -196,7 +196,10 @@ uint16_t SPIDevice::derive_freq_flag(uint32_t _frequency)
 bool SPIDevice::transfer(const uint8_t *send, uint32_t send_len,
                          uint8_t *recv, uint32_t recv_len)
 {
-    bus.semaphore.assert_owner();
+    if (!bus.semaphore.check_owner()) {
+        hal.console->printf("SPI: not owner of 0x%x\n", unsigned(get_bus_id()));
+        return false;
+    }
     if (send_len == recv_len && send == recv) {
         // simplest cases, needed for DMA
         do_transfer(send, recv, recv_len);