RT allocator tidy ups v2

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Hi all,

this series has a bunch of tidy ups preparing for my research into
per-RTG RT bitmaps.

The first is a fix for a one-off bug that I could only reproduce with
my hacky patches, but which seems real.  The second- and third-last
patches change the policy for retrying allocations that didn't succeed
and could use very careful review.  The rest is fairly mechanic
cleanups.

Changes since v1:
 - various spelling fixes
 - split and refine the cleanups to xfs_rtallocate_block
 - rename xfs_bmap_rtalloc

Diffstat:
 libxfs/xfs_bmap.c     |   57 ++--
 libxfs/xfs_bmap.h     |    2 
 libxfs/xfs_format.h   |   14 -
 libxfs/xfs_rtbitmap.c |  106 +++-----
 libxfs/xfs_rtbitmap.h |    4 
 libxfs/xfs_types.h    |    1 
 scrub/rtsummary.c     |    2 
 xfs_bmap_util.c       |  141 ----------
 xfs_bmap_util.h       |   17 -
 xfs_quota.h           |    5 
 xfs_rtalloc.c         |  648 +++++++++++++++++++++++++-------------------------
 xfs_rtalloc.h         |   37 --
 12 files changed, 419 insertions(+), 615 deletions(-)




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