libpod: fix wastedassign warning on freebsd

This one:

> libpod/container_internal_freebsd.go:255:2: assigned to foundUTS, but reassigned without using the value (wastedassign)
> 	foundUTS := false
> 	^

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libpod/container_internal_freebsd.go

@@ -255,10 +255,9 @@ func (c *Container) addSharedNamespaces(g *generate.Generator) error {
 	// the user (already present in OCI spec). If we don't have a UTS ns,
 	// set it to the host's hostname instead.
 	hostname := c.Hostname()
-	foundUTS := false
 
 	// TODO: make this optional, needs progress on adding FreeBSD section to the spec
-	foundUTS = true
+	foundUTS := true
 	g.SetHostname(hostname)
 
 	if !foundUTS {