update mount.c, in order to pass through -n.

update mount.c, in order to pass through -n.

autofs uses automount, which calls fuse, during an sshfs call. fuse complains about -n being an unknown option (ref. https://github.com/libfuse/libfuse/issues/715)
this one line edit provides the command to be accepted, and pass through, allowing autofs-automount to operate on the mount, even though it is already in the mtab, given the nature of autofs/automount.