rsync: denial of service

The previous rsync security errata update, which was applied with the rsync tool update to version 3.0.6-4, introduced a patch which fixed the issue with missing memory deallocation. Due to an error in that patch, the following new issue appeared: when specifying the source or destination argument of the rsync command without the optional user@ argument, rsync failed to provide the correct parameters to an external command, such as ssh, and thus rsync failed with an error.