If you specified the port number on the command line, convert it to an int.
If you specified the port number on the command line, convert it to an int.

This gets rid of an exception.

Signed-off-by: Avery Pennarun <e03ccfb89d416c4697ad6970ce86a92c1c28a78e@gmail.com>

ToxicFrog/bup,jbaber/bup,tjanez/bup,gevaerts/bup,gevaerts/bup,apenwarr/bup,tjanez/bup,mhoeher/bup,jbaber/bup,pombredanne/bup,apenwarr/bup,apenwarr/bup,ToxicFrog/bup,jbaber/bup,gevaerts/bup,mhoeher/bup,pombredanne/bup,tjanez/bup,tjanez/bup,jbaber/bup,pombredanne/bup,tjanez/bup,pombredanne/bup,mhoeher/bup,mhoeher/bup,jbaber/bup,mhoeher/bup,gevaerts/bup,pombredanne/bup,mhoeher/bup,jbaber/bup,pombredanne/bup,ToxicFrog/bup,ToxicFrog/bup,gevaerts/bup,apenwarr/bup,tjanez/bup,ToxicFrog/bup