avcodec/libaribb24,ttmlenc, avutil/tx: Remove redundant init of AVBPrint

An AVBPrint is initialized via av_bprint_init() (or
av_bprint_init_for_buffer()) which expects uninitialized
AVBPrints; it is therefore not necessary to zero them before
the actual initialization.

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

libavcodec/libaribb24.c

@@ -227,7 +227,7 @@ static int libaribb24_handle_regions(AVCodecContext *avctx, AVSubtitle *sub)
     Libaribb24Context *b24 = avctx->priv_data;
     const arib_buf_region_t *region = arib_decoder_get_regions(b24->decoder);
     unsigned int profile_font_size = get_profile_font_size(avctx);
-    AVBPrint buf = { 0 };
+    AVBPrint buf;
     int ret = 0;
 
     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);

libavcodec/ttmlenc.c

@@ -45,7 +45,7 @@ typedef struct {
 static void ttml_text_cb(void *priv, const char *text, int len)
 {
     TTMLContext *s = priv;
-    AVBPrint cur_line = { 0 };
+    AVBPrint cur_line;
     AVBPrint *buffer = &s->buffer;
 
     av_bprint_init(&cur_line, len, AV_BPRINT_SIZE_UNLIMITED);

libavutil/tx.c

@@ -595,7 +595,7 @@ static void print_type(AVBPrint *bp, enum AVTXType type)
 
 static void print_cd_info(const FFTXCodelet *cd, int prio, int len, int print_prio)
 {
-    AVBPrint bp = { 0 };
+    AVBPrint bp;
     av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
 
     av_bprintf(&bp, "%s - type: ", cd->name);
@@ -718,7 +718,7 @@ av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
     int codelet_list_idx = codelet_list_num;
     int nb_cd_matches = 0;
 #if !CONFIG_SMALL
-    AVBPrint bp = { 0 };
+    AVBPrint bp;
 #endif
 
     /* We still accept functions marked with SLOW, even if the CPU is