lavfi: do not pass opaque field to init functions

Fix signature mismatch warnings.

libavfilter/avf_showwaves.c

@@ -57,7 +57,7 @@ static const AVOption showwaves_options[] = {
 
 AVFILTER_DEFINE_CLASS(showwaves);
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     ShowWavesContext *showwaves = ctx->priv;
     int err;

libavfilter/vf_thumbnail.c

@@ -43,7 +43,7 @@ typedef struct {
     struct thumb_frame *frames; ///< the n_frames frames
 } ThumbContext;
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     ThumbContext *thumb = ctx->priv;
 

libavfilter/vf_tile.c

@@ -39,7 +39,7 @@ typedef struct {
 
 #define REASONABLE_SIZE 1024
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     TileContext *tile = ctx->priv;
     int r;

libavfilter/vf_tinterlace.c

@@ -80,7 +80,7 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     TInterlaceContext *tinterlace = ctx->priv;
     int i;

libavfilter/vsrc_cellauto.c

@@ -158,7 +158,7 @@ static int init_pattern_from_file(AVFilterContext *ctx)
     return init_pattern_from_string(ctx);
 }
 
-static int init(AVFilterContext *ctx, const char *args, void *opaque)
+static int init(AVFilterContext *ctx, const char *args)
 {
     CellAutoContext *cellauto = ctx->priv;
     AVRational frame_rate;

libavfilter/vsrc_life.c

@@ -219,7 +219,7 @@ static int init_pattern_from_file(AVFilterContext *ctx)
     return 0;
 }
 
-static int init(AVFilterContext *ctx, const char *args, void *opaque)
+static int init(AVFilterContext *ctx, const char *args)
 {
     LifeContext *life = ctx->priv;
     AVRational frame_rate;

libavfilter/vsrc_mandelbrot.c

@@ -108,7 +108,7 @@ static const AVOption mandelbrot_options[] = {
 
 AVFILTER_DEFINE_CLASS(mandelbrot);
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     MBContext *mb = ctx->priv;
     AVRational rate_q;

libavfilter/vsrc_mptestsrc.c

@@ -256,7 +256,7 @@ static void ring2_test(uint8_t *dst, int dst_linesize, int off)
     }
 }
 
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     MPTestContext *test = ctx->priv;
     AVRational frame_rate_q;