tty: n_smux: Update logging to handle broadcast ID

Add range checking of the channel ID for packet logging.  This prevents
out-of-bounds array access when reading the channel state.

Change-Id: Ic91b29e89ef9997525f6283b8212408cccd646f8
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
1 file changed