xfs: clean up xfs_alloc_ag_vextent_exact
Use a goto label to consolidate all block not found cases, and add a tracepoint for them. Also clean up a few whitespace issues. Based on an earlier patch from Dave Chinner. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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