libtailscale: fix logf and printf format specifiers

Updates #cleanup

Signed-off-by: Nick Khyl <nickk@tailscale.com>

Author: nickkhyl

libtailscale/backend.go

@@ -309,7 +309,7 @@ func (a *App) newBackend(dataDir string, appCtx AppContext, store *stateStore,
 
 	netMon, err := netmon.New(b.bus, logf)
 	if err != nil {
-		log.Printf("netmon.New: %w", err)
+		log.Printf("netmon.New: %v", err)
 	}
 	b.netMon = netMon
 	b.setupLogs(dataDir, logID, logf, sys.HealthTracker.Get())

libtailscale/tailscale.go

@@ -153,7 +153,7 @@ func (b *backend) setupLogs(logDir string, logID logid.PrivateID, logf logger.Lo
 		for {
 			select {
 			case logstr := <-onLog:
-				b.logger.Logf(logstr)
+				b.logger.Logf("%s", logstr)
 			}
 		}
 	}()