PX4: make compass calibrate fail non-fatal

until we sort out what is going on with compass calibration failures
this is the best option

mk/PX4/ROMFS/init.d/rc.APM

@@ -198,7 +198,7 @@ then
         else 
           echo "hmc5883 calibrate failed"
           echo "hmc5883 calibrate failed" >> $logfile
-          sh /etc/init.d/rc.error
+          tone_alarm MSBBB
         fi
     else
         echo "hmc5883 start failed"
@@ -229,7 +229,7 @@ else
         else 
           echo "hmc5883 calibrate failed"
           echo "hmc5883 calibrate failed" >> $logfile
-          sh /etc/init.d/rc.error
+          tone_alarm MSBBB
         fi
     fi