Revert "pipe dump1090's out to the logger"

This reverts commit d66047c4ea.

main/gen_gdl90.go

@@ -832,13 +832,12 @@ func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU()) // redundant with Go v1.5+ compiler
 
 	// Duplicate log.* output to debugLog.
-	var mfp io.Writer
 	fp, err := os.OpenFile(debugLog, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
 	if err != nil {
 		log.Printf("Failed to open '%s': %s\n", debugLog, err.Error())
 	} else {
 		defer fp.Close()
-		mfp = io.MultiWriter(fp, os.Stdout)
+		mfp := io.MultiWriter(fp, os.Stdout)
 		log.SetOutput(mfp)
 	}
 
@@ -848,7 +847,7 @@ func main() {
 	MsgLog = make([]msg, 0)
 
 	crcInit() // Initialize CRC16 table.
-	sdrInit(mfp)
+	sdrInit()
 	initTraffic()
 
 	globalStatus.Version = stratuxVersion

main/sdr.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"io"
 	"log"
 	"os/exec"
 	"strconv"
@@ -24,7 +23,6 @@ type ES struct {
 	indexID int
 }
 
-var mfp io.Writer
 var UATDev *UAT
 var ESDev *ES
 
@@ -40,10 +38,6 @@ func (e *ES) read() {
 	defer es_wg.Done()
 	log.Println("Entered ES read() ...")
 	cmd := exec.Command("/usr/bin/dump1090", "--net", "--device-index", strconv.Itoa(e.indexID))
-	if mfp != nil {
-		cmd.Stdout = mfp
-		cmd.Stderr = cmd.Stdout
-	}
 	err := cmd.Start()
 	if err != nil {
 		log.Printf("Error executing /usr/bin/dump1090: %s\n", err.Error())
@@ -388,8 +382,7 @@ func sdrWatcher() {
 	}
 }
 
-func sdrInit(m io.Writer) {
-	mfp = m
+func sdrInit() {
 	go sdrWatcher()
 	go uatReader()
 	godump978.Dump978Init()