avformat/ttmlenc: Avoid unnecessary block

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/ttmlenc.c

@@ -124,16 +124,14 @@ static int ttml_set_header_values_from_extradata(
 static int ttml_write_header(AVFormatContext *ctx)
 {
     TTMLMuxContext *ttml_ctx = ctx->priv_data;
-    ttml_ctx->document_written = 0;
-
-    {
     AVStream    *st = ctx->streams[0];
     AVIOContext *pb = ctx->pb;
 
-        AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,
+    const AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,
                                                 0);
     const char *printed_lang = (lang && lang->value) ? lang->value : "";
 
+    ttml_ctx->document_written = 0;
     ttml_ctx->input_type = ff_is_ttml_stream_paragraph_based(st->codecpar) ?
                            PACKET_TYPE_PARAGRAPH :
                            PACKET_TYPE_DOCUMENT;
@@ -156,7 +154,6 @@ static int ttml_write_header(AVFormatContext *ctx)
                     printed_lang,
                     header_params.pre_body_elements);
     }
-    }
 
     return 0;
 }