ltrace shows:
fopen("/sys/class/hwmon/hwmon0/device/name", "r")

the part containing device is not accurate for kernels currently in Fedora 22. I do not know if it is still valid for kernels in the past. I wrote some of this code for Zabbix a long time ago.

It appears that in Linux kernels >= 4.x (not sure if it started earlier) that the device part of the file names for sensors is no long appropriate to find the device name. I believe there was a case where it some times was under device and sometimes not. Now it appears that it NEVER is.