libmultipath: do not fallback to search /proc/partitions
libmultipath: do not fallback to search /proc/partitions

devt2devname() reverse-maps the device number to the
device name. However, when a device is not found in
/sys/block/dev it's pointless to retry searching for
it in /proc/partitions, as both carry the same information.
And the search in /proc/partitions is only meant for
systems not providing /sys/block.

Signed-off-by: Hannes Reinecke <b0d1e9e4a4e27620745ff49be9000da3174a4cc6@suse.de>

unakatsuo/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,unakatsuo/multipath-tools,vijaychauhan/multipath-tools