commit-graph write: remove empty line for readability

Remove the empty line between a QSORT(...) and the subsequent oideq()
for-loop. This makes it clearer that the QSORT(...) is being done so
that we can run the oideq() loop on adjacent OIDs. Amends code added
in 08fd81c9b6 ("commit-graph: implement write_commit_graph()",
2018-04-02).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit-graph.c

@@ -896,7 +896,6 @@ void write_commit_graph(const char *obj_dir,
 	close_reachable(&oids, report_progress);
 
 	QSORT(oids.list, oids.nr, commit_compare);
-
 	count_distinct = 1;
 	for (i = 1; i < oids.nr; i++) {
 		if (!oideq(&oids.list[i - 1], &oids.list[i]))