TAKE 974005 - xfs_lowbit64 broken on 32bit platforms

[dgc@xxxxxxx (David Chinner)]

Fix xfs_lowbit64

xfs_lowbit64 was broken on 32 bit platforms in a recent cleanup of
the xfs bitops. Fix it back up again.


Date:  Thu Dec  6 16:28:59 AEDT 2007
Workarea:  chook.melbourne.sgi.com:/build/dgc/isms/2.6.x-xfs
Inspected by:  lachlan@xxxxxxx

The following file(s) were checked into:
  longdrop.melbourne.sgi.com:/isms/linux/2.6.x-xfs-melb


Modid:  xfs-linux-melb:xfs-kern:30202a
fs/xfs/xfs_bit.h - 1.22 - changed
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_bit.h.diff?r1=text&tr1=1.22&r2=text&tr2=1.21&f=h
        - make the temporary variable in xfs_lowbit64 the correct type
          so that 32bit platforms work as well.