blame: drop explicit check for commit graph

Our blaming subsystem knows to use bloom filters from commit graphs to
speed up the whole computation. The setup of this happens in
`setup_blame_bloom_data()`, where we first verify that we even have a
commit graph in the first place. This check is redundant though, as we
call `get_bloom_filter_settings()` immediately afterwards which, which
already knows to return a `NULL` pointer in case we don't have a commit
graph.

Drop the redundant check.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

blame.c

@@ -2909,9 +2909,6 @@ void setup_blame_bloom_data(struct blame_scoreboard *sb)
 	struct blame_bloom_data *bd;
 	struct bloom_filter_settings *bs;
 
-	if (!sb->repo->objects->commit_graph)
-		return;
-
 	bs = get_bloom_filter_settings(sb->repo);
 	if (!bs)
 		return;