libsysutils: Hide NetlinkListener error in recovery

* Prevents users from seeing this message in recovery:
  `E:recvmsg failed (No buffer space available)`

* This is caused by volume_manager (our addition in recovery) and
  hiding this error does not seem to have any negative side effect.

Change-Id: I0d65796961c3036289ed13c0b8949a27b5b97ad6