[rygel] server: Fix TimeSeekRange header formatting

[Jens Georg <jensgeorg src gnome org>]

commit 00a1c9344af3f1a68b3bfbab44cd7f358877262d
Author: Jens Georg <mail jensge org>
Date:   Mon May 4 21:51:43 2020 +0200

    server: Fix TimeSeekRange header formatting
    
    Fixes #161

 src/librygel-server/rygel-http-time-seek-response.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/librygel-server/rygel-http-time-seek-response.vala 
b/src/librygel-server/rygel-http-time-seek-response.vala
index 9f0eb0c1..905c83f8 100644
--- a/src/librygel-server/rygel-http-time-seek-response.vala
+++ b/src/librygel-server/rygel-http-time-seek-response.vala
@@ -204,6 +204,7 @@ public class Rygel.HTTPTimeSeekResponse : Rygel.HTTPResponseElement {
         // object owner. To form the response, we just use what is set.
 
         var response = new StringBuilder ();
+        var locale = Intl.setlocale (LocaleCategory.NUMERIC, "C");
         response.append ("npt=");
         response.append_printf ("%.3f-",
                                 (double) this.start_time / TimeSpan.SECOND);
@@ -217,6 +218,7 @@ public class Rygel.HTTPTimeSeekResponse : Rygel.HTTPResponseElement {
         } else {
             response.append ("/*");
         }
+        Intl.setlocale (LocaleCategory.NUMERIC, locale);
 
         if ((this.start_byte != UNSPECIFIED) &&
             (this.end_byte != UNSPECIFIED)) {