Remove obsolete comments

In the below comment line, already codes for log exists so
following comment is obsolete.
// TODO log

Signed-off-by: Daehyeok Mun <daehyeok@gmail.com>

trust/trusts.go

@@ -182,7 +182,6 @@ func (t *TrustStore) fetch() {
 		go func() {
 			err := t.reload()
 			if err != nil {
-				// TODO log
 				log.Infof("Reload of trust graph failed: %s", err)
 			}
 		}()