TAKE - fix error cleanup code in mount

[Steve Lord <lord@sgi.com>]

XFS was confusing the upper vfs layers during a failed
mount. We need to clean s_root if a mount fails after
we have set it.

Date:  Sun Aug 26 17:16:10 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:101605a
linux/fs/xfs/linux/xfs_super.c - 1.135
	- Fix cleanup in failed mount case, plus a couple of out of mem cases
	  during mount.