avfilter/buffersrc: remove redundant flag

!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params)

equals

(c->pix_fmt == AV_PIX_FMT_NONE) && !c->got_format_from_params

1. When (c->pix_fmt == AV_PIX_FMT_NONE) is true, got_format_from_params is
always false, the flag doesn't contribute to the result.

2. When the first part is false, the second part doesn't matter, the flag
doesn't contribute to the result.

The result only depends on c->pix_fmt.

libavfilter/buffersrc.c

@@ -62,7 +62,6 @@ typedef struct BufferSourceContext {
     uint64_t channel_layout;
     char    *channel_layout_str;
 
-    int got_format_from_params;
     int eof;
 } BufferSourceContext;
 
@@ -104,7 +103,6 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
     switch (ctx->filter->outputs[0].type) {
     case AVMEDIA_TYPE_VIDEO:
         if (param->format != AV_PIX_FMT_NONE) {
-            s->got_format_from_params = 1;
             s->pix_fmt = param->format;
         }
         if (param->width > 0)
@@ -124,7 +122,6 @@ int av_buffersrc_parameters_set(AVFilterContext *ctx, AVBufferSrcParameters *par
         break;
     case AVMEDIA_TYPE_AUDIO:
         if (param->format != AV_SAMPLE_FMT_NONE) {
-            s->got_format_from_params = 1;
             s->sample_fmt = param->format;
         }
         if (param->sample_rate > 0)
@@ -268,7 +265,7 @@ static av_cold int init_video(AVFilterContext *ctx)
 {
     BufferSourceContext *c = ctx->priv;
 
-    if (!(c->pix_fmt != AV_PIX_FMT_NONE || c->got_format_from_params) || !c->w || !c->h ||
+    if (c->pix_fmt == AV_PIX_FMT_NONE || !c->w || !c->h ||
         av_q2d(c->time_base) <= 0) {
         av_log(ctx, AV_LOG_ERROR, "Invalid parameters provided.\n");
         return AVERROR(EINVAL);
@@ -321,7 +318,7 @@ static av_cold int init_audio(AVFilterContext *ctx)
     BufferSourceContext *s = ctx->priv;
     int ret = 0;
 
-    if (!(s->sample_fmt != AV_SAMPLE_FMT_NONE || s->got_format_from_params)) {
+    if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
         av_log(ctx, AV_LOG_ERROR, "Sample format was not set or was invalid\n");
         return AVERROR(EINVAL);
     }