compaction: dont rely on undefined behavior when making garbage collected writer
compaction: dont rely on undefined behavior when making garbage collected writer

Argument evaluation order is UB, so it's not guaranteed that
c->make_garbage_collected_sstable_writer() is called before
compaction is moved to run().

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>
Message-Id: <20191023052647.9066-1-1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

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