lnd: partially fix golint warnings

chainntnfs/log.go

@@ -7,7 +7,7 @@ import (
 	"github.com/btcsuite/btclog"
 )
 
-// log is a logger that is initialized with no output filters.  This
+// Log is a logger that is initialized with no output filters.  This
 // means the package will not perform any logging by default until the caller
 // requests it.
 var Log btclog.Logger