treewide: remove comparison with boolean constant

Change-Id: Iae5abb2a470865f0a831ed770b16eb439589d012
Reviewed-on: https://review.monogon.dev/c/monogon/+/3008
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Vouch-Run-CI: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/pkg/event/memory/memory.go b/metropolis/pkg/event/memory/memory.go
index c684c18..7402d64 100644
--- a/metropolis/pkg/event/memory/memory.go
+++ b/metropolis/pkg/event/memory/memory.go
@@ -206,7 +206,7 @@
 		if opt.Predicate != nil {
 			predicate = opt.Predicate
 		}
-		if opt.BacklogOnly != false {
+		if opt.BacklogOnly {
 			return empty, errors.New("BacklogOnly is not implemented for memory watchers")
 		}
 	}