Fix sysfs path detection for /dev/nvme* and /dev/dm-* #63
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Before this PR,
multiload_graph_disk_get_filterandmultiload_graph_disk_get_dataattempt to read from the following sysfs paths on my computer. Both are invalid, which leads to no devices or data in the disk graph:After my changes, the block device prefixes are calculated correctly for nvme and dm- devices:
There is probably a better way to get this sysfs path than by doing string manipulation, but I don't know it.