jsm: Rewriting a bad log message

Actually jsm displays "Device Added" 8 times (for a 8 port device).
This silly patch just makes things more informative, showing
the port (instead of the device) that was added.

Signed-off-by: Breno Leitão <leitao@linux.vnet.ibm.com>
Cc: Scott Kilau <scottk@digi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>