os.linux: Fix NPE in input/output analysis
The block rq sector field is not present in the block_bio_frontmerge
event, but can easily be computed from the other field data.
Change-Id: Ib5b056d97cffac82a8bcfa1be80bc713504091a1
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/90555
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
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