all: Fix check for empty string (#8456)

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

cmd/stcrashreceiver/main.go

@@ -90,7 +90,7 @@ func handleFailureFn(dsn, failureDir string) func(w http.ResponseWriter, req *ht
 			for k, v := range r.Extra {
 				pkt.Extra[k] = v
 			}
-			if len(r.Goroutines) != 0 {
+			if r.Goroutines != "" {
 				url, err := saveFailureWithGoroutines(r.FailureData, failureDir)
 				if err != nil {
 					log.Println("Saving failure report:", err)

cmd/syncthing/main.go

@@ -647,7 +647,7 @@ func syncthingMain(options serveOptions) {
 
 	setupSignalHandling(app)
 
-	if len(os.Getenv("GOMAXPROCS")) == 0 {
+	if os.Getenv("GOMAXPROCS") == "" {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}