TAKE - fix assert failure in debug kernels

[Steve Lord <lord@xxxxxxx>]

Bad assertion added with fix merged from irix, the change will only matter
if you turn on the xfs debug code.

Date:  Mon Mar 26 07:50:52 PST 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:90850a
linux/fs/xfs/xfs_log.c - 1.232
        - Fix incorrect debug code, there is an assert for log buffers not being
          in the correct state, the assert is valid, but it was being applied to
          too many log buffers. Make the whole check debug specific, and add 
logic
          to drop out of the loop at the correct point.