PX4/Firmware — pull request #1538 by stephanbro (2014-12-26 23:49:28+00:00)
Title: mavlink: Removed warnx that references a deleted pointer and causes a ha...

...rdfault.

To reproduce the hard fault, run something similar to the following in nsh:
```mavlink stream -s HEARTBEAT -r 0```
The warnx is removed instead of moved, as there is already a method of telling the user that the stream was disabled after checking for requested subscription using configure_stream().