Clean up datastore related linter findings

datastore/retention.go

@@ -90,9 +90,9 @@ retentionLoop:
 			dur := time.Minute - since
 			log.Tracef("Retention scanner sleeping for %v", dur)
 			select {
-			case _ = <-rs.globalShutdown:
+			case <-rs.globalShutdown:
 				break retentionLoop
-			case _ = <-time.After(dur):
+			case <-time.After(dur):
 			}
 		}
 		// Kickoff scan
@@ -102,7 +102,7 @@ retentionLoop:
 		}
 		// Check for global shutdown
 		select {
-		case _ = <-rs.globalShutdown:
+		case <-rs.globalShutdown:
 			break retentionLoop
 		default:
 		}
@@ -159,9 +159,7 @@ func (rs *RetentionScanner) doScan() error {
 // Join does not retun until the retention scanner has shut down
 func (rs *RetentionScanner) Join() {
 	if rs.retentionShutdown != nil {
-		select {
-		case <-rs.retentionShutdown:
-		}
+		<-rs.retentionShutdown
 	}
 }