ref_transaction_commit(): remove local variables n and updates
These microoptimizations don't make a significant difference in speed.
And they cause problems if somebody ever wants to modify the function to
add updates to a transaction as part of processing it, as will happen
shortly.
Make the same changes in initial_ref_transaction_commit().
Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu>
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