TAKE - fix xfs_zero_eof bug with sparse files

[Steve Lord <lord@xxxxxxx>]

xfs_zero_eof got reimplemnted with a nwe callign interface,
but a couple of old calls remain. Fix it so that evryone
speaks the same lingo. Thanks to Kip Macy for reporting
this.

Modid:  2.3.99pre2-xfs:slinx:56556a
Date:  Mon Apr  3 19:40:50 PDT 2000
Workarea:  clink.americas.sgi.com:/data/clink/io/lord/slinx-xfs-2.3.99pre2

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.3.99pre2-xfs

linux/fs/xfs/linux/xfs_lrw.c - 1.31
http://oss.sgi.com/cgi-bin/cvsweb.cgi/linux-2.4-xfs/linux/fs/xfs/linux/xfs_lrw.c.diff?r1=text&tr1=1.31&r2=text&tr2=1.30&f=h
        - Change xfs_zero_eof to take a vnode rather than an inode
          so that all the callers pass it the same thing!