host/mesh: Remove lpn timeout param check
host/mesh: Remove lpn timeout param check

param can never be NULL here, so the check is redundant. Coverity is
complaining because param is accessed before the NULL check.

This is port of 4eb047d1afdbb159527b821552be6d79e84fb1e4

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble