xfs: fix uninitialized field in rtbitmap fsmap backend
Initialize the extent count field of the high key so that when we use the high key to synthesize an 'unknown owner' record (i.e. used space record) at the end of the queried range we have a field with which to compute rm_blockcount. This is not strictly necessary because the synthesizer never uses the rm_blockcount field, but we can shut up the static code analysis anyway. Coverity-id: 1437358 Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Reviewed-by: NAllison Henderson <allison.henderson@oracle.com> Reviewed-by: NChristoph Hellwig <hch@lst.de>
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