Panic is used in library instead of returning error

[isodude]

At

mtr/pkg/icmp/icmp.go

Line 43 in 1c17592

log.Panicf("Failed to listen to address %v. Msg: %v.", localAddr, err.Error())

the code is throwing a panic, which when using this code as a library is quite devastating.

I'm using it for a mtr plugin in telegraf.