fusefs: delete dead code

These lines have been commented out ever since the first import of fuse.
The intention seems to be for the original developer to experiment with
different error handling strategies, but they're very obsolete by now.
Delete them.

MFC after: 2 weeks
Sponsored by: ConnectWise

(cherry picked from commit 7ce93195ddb30b371022ae3adbd9bd24189e1444)