lvresize.c: use kilobytes when passing sizes to fsadm

[Milan Broz <mbroz@redhat.com>]

Bryn M. Reeves wrote:
> The code in lvresize.c computes a new file system size to pass to 
> fsadm when resizing as (extents * extent_size), giving a result in 
> kilobytes.
> 
> This is then passed on to fsadm without a suffix, meaning that fsadm 
> interprets it as a count of the number of file system blocks instead.
> 
> This breaks fsadm for all file system block sizes other than 1K.
> 
> The attached patch adds a "K" suffix and fixes the problem for me - see:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=480022

Reviewed-by: Milan Broz <mbroz@redhat.com>
Tested-by: Milan Broz <mbroz@redhat.com>

(btw lvresize -r still works but is is not mentioned in man page, it is
intentional to prefer using fsadm --lvresize now?)

Milan

p.s.
Jaroslav, please can you add some tests internally for fsadm/lvresize?
(test in bugzilla, just extend/reduce for 1024,2048,4096 fs blocksize,
mke2fs -b <bs> is enough (or maybe xfs, reiserfs tests too))