d13489e2be3e698616b1da3c8267709115d3d099
device_setup_unit() might be called (when an event happened in /proc/self/mountinfo for example) with a null 'dev' parameter. This indicates that the device has been unplugged but the corresponding mountpoint is still visible in /proc/self/mountinfo. This patch makes sure we don't call device_is_bound_by_mounts() in this case. Fixes: #5025
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