fe: remove redundant special case
fe: remove redundant special case

We haven't been logging *any* zero exits for a while, so there's no
longer any need to filter out zero exits of ISOSR specifically.

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@citrix.com>

xapi-project/message-switch,johnelse/forkexecd,xapi-project/message-switch,djs55/forkexecd,xapi-project/message-switch