xfs_io: clean up the funshare command a bit

Add proper argument parsing to the funshare command so that when you
pass it nonexistent --help it will print the help instead of complaining
that it can't convert that to a number.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
1 file changed