TAKE - fix super block locking problems

[Steve Lord <lord@sgi.com>]

Bug from the 2.4.8 merge, internal testing caught a hang - too few unlocks
and an oops, too many unlocks (and a free). You have to use dump/restore
or the regression tests to hit this I think.

Date:  Mon Aug 13 18:11:07 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:100652a
linux/fs/xfs/linux/xfs_vfs.c - 1.25
	- Fix drop_super calls inside xfs, sometimes we did too many, sometimes
	  too few.