chanbackup+rpcserver+server: return number of recovered channels

server.go

@@ -2248,7 +2248,7 @@ func (s *server) Start() error {
 			chainArb:   s.chainArb,
 		}
 		if len(s.chansToRestore.PackedSingleChanBackups) != 0 {
-			err := chanbackup.UnpackAndRecoverSingles(
+			_, err := chanbackup.UnpackAndRecoverSingles(
 				s.chansToRestore.PackedSingleChanBackups,
 				s.cc.KeyRing, chanRestorer, s,
 			)
@@ -2259,7 +2259,7 @@ func (s *server) Start() error {
 			}
 		}
 		if len(s.chansToRestore.PackedMultiChanBackup) != 0 {
-			err := chanbackup.UnpackAndRecoverMulti(
+			_, err := chanbackup.UnpackAndRecoverMulti(
 				s.chansToRestore.PackedMultiChanBackup,
 				s.cc.KeyRing, chanRestorer, s,
 			)