TAKE - fix xfs inode handling code

[Steve Lord <lord@xxxxxxx>]

Previous version did not cope with prune_icache and iget racing in the
xfs cache.

Date:  Sun May 27 13:46:48 PDT 2001
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:96003a
linux/fs/xfs/xfs_iget.c - 1.144
        - Look out for inode which are being freed or cleared when scanning
          the xfs inode hash for a match, skip these entries, drop the locks
          and try again.

linux/fs/xfs/linux/xfs_super.c - 1.125
        - remove unreachable case