Use Go code for output network stream

Calling the external program `ffmpeg` should be avoided completely in
the future to make soundbox-go a pure Go code base. `ffmpeg` provides
the following functionality to soundbox-go:

- web radio input stream transport
- re-encoding of the audio stream
- output stream transport to soundbox devices

The last part should be replaced with this commit as a first step.

1 files changed, 1 insertions, 1 deletions

diff --git a/soundbox/interfaces.go b/soundbox/interfaces.go
index 2854b1a..04839c7 100644
--- a/soundbox/interfaces.go
+++ b/soundbox/interfaces.go
@@ -17,7 +17,7 @@ func getInterface() (net.Interface, error) {
 	}
 
 	for _, iface := range all {
-		if iface.Flags & net.FlagUp == 0 {
+		if iface.Flags&net.FlagUp == 0 {
 			continue
 		}
 		addresses, err := iface.Addrs()