[PATCH] invutil: fix a gcc warning

[Alex Elder]

On Thu, 2011-09-22 at 12:48 -0400, Christoph Hellwig wrote:
> We never use the lines variable in put_line, except by writing to.  Replace
> the fairly ugly getmaxyx macro causing this with the getmaxx call (which
> is used by getmaxyx underneath) to only get the number of columns.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good.

Reviewed-by: Alex Elder <aelder at sgi.com>