[multipath] yet another unchecked devt2devname() return value
[multipath] yet another unchecked devt2devname() return value

This one caused a multipath -ll with no cache loaded to wait for a 
pathinfo(nul) to complete for a path discovered in the map but not
present anymore in sysfs.


unakatsuo/multipath-tools,grzn/multipath-tools-explained,gebi/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,grzn/multipath-tools-explained