toggledlog: convert remaing naked fmt.Print*

Several fatal errors were just printed to stdout, which
meant they were invisible when running the test suite.

Fix this by introducing toggledlog.Fatal and convert as
follows:

Fatal errors     -> toggledlog.Fatal
Warnings         -> toggledlog.Warn
Password prompts -> fmt.Fprintf

1 files changed, 4 insertions, 3 deletions

diff --git a/internal/prefer_openssl/prefer.go b/internal/prefer_openssl/prefer.go
index 16788e0..0bc24b4 100644
--- a/internal/prefer_openssl/prefer.go
+++ b/internal/prefer_openssl/prefer.go
@@ -1,9 +1,10 @@
 package prefer_openssl
 
 import (
-	"fmt"
 	"io/ioutil"
 	"regexp"
+
+	"github.com/rfjakob/gocryptfs/internal/toggledlog"
 )
 
 // filePreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
@@ -17,12 +18,12 @@ import (
 func filePreferOpenSSL(file string) bool {
 	ci, err := ioutil.ReadFile(file)
 	if err != nil {
-		fmt.Println(err)
+		toggledlog.Warn.Println(err)
 		return true
 	}
 	haveAes, err := regexp.Match(`(?m)^flags.*\baes\b`, ci)
 	if err != nil {
-		fmt.Println(err)
+		toggledlog.Warn.Println(err)
 		return true
 	}
 	return !haveAes