avutil/hwcontext: Remove unused AVHWDeviceInternal.priv

It is no longer used by any hwcontext, as they all allocate
their private data together with their public data and access
it via AVHWDeviceContext.hwctx.

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

libavutil/hwcontext.c

@@ -139,7 +139,6 @@ static void hwdevice_ctx_free(void *opaque, uint8_t *data)
     av_buffer_unref(&ctx->internal->source_device);
 
     av_freep(&ctx->hwctx);
-    av_freep(&ctx->internal->priv);
     av_freep(&ctx->internal);
     av_freep(&ctx);
 }
@@ -168,12 +167,6 @@ AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
     if (!ctx->internal)
         goto fail;
 
-    if (hw_type->device_priv_size) {
-        ctx->internal->priv = av_mallocz(hw_type->device_priv_size);
-        if (!ctx->internal->priv)
-            goto fail;
-    }
-
     if (hw_type->device_hwctx_size) {
         ctx->hwctx = av_mallocz(hw_type->device_hwctx_size);
         if (!ctx->hwctx)
@@ -194,8 +187,6 @@ AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
     return buf;
 
 fail:
-    if (ctx->internal)
-        av_freep(&ctx->internal->priv);
     av_freep(&ctx->internal);
     av_freep(&ctx->hwctx);
     av_freep(&ctx);

libavutil/hwcontext_internal.h

@@ -41,11 +41,6 @@ typedef struct HWContextType {
      * i.e. AVHWDeviceContext.hwctx
      */
     size_t             device_hwctx_size;
-    /**
-     * size of the private data, i.e.
-     * AVHWDeviceInternal.priv
-     */
-    size_t             device_priv_size;
 
     /**
      * Size of the hardware-specific device configuration.
@@ -102,7 +97,6 @@ typedef struct HWContextType {
 
 struct AVHWDeviceInternal {
     const HWContextType *hw_type;
-    void                *priv;
 
     /**
      * For a derived device, a reference to the original device