amfenc: Remove spurious initialisations

Also minor cosmetics.

libavcodec/amfenc.c

@@ -108,15 +108,10 @@ static AMFTraceWriterVtbl tracer_vtbl =
 static int amf_load_library(AVCodecContext *avctx)
 {
     AmfContext        *ctx = avctx->priv_data;
-    AMFInit_Fn              init_fun = NULL;
-    AMFQueryVersion_Fn      version_fun = NULL;
-    AMF_RESULT              res = AMF_OK;
+    AMFInit_Fn         init_fun;
+    AMFQueryVersion_Fn version_fun;
+    AMF_RESULT         res;
 
-    ctx->eof = 0;
-    ctx->delayed_drain = 0;
-    ctx->hw_frames_ctx = NULL;
-    ctx->hw_device_ctx = NULL;
-    ctx->delayed_surface = NULL;
     ctx->delayed_frame = av_frame_alloc();
     if (!ctx->delayed_frame) {
         return AVERROR(ENOMEM);
@@ -328,7 +323,7 @@ static int amf_init_encoder(AVCodecContext *avctx)
 {
     AmfContext        *ctx = avctx->priv_data;
     const wchar_t     *codec_id = NULL;
-    AMF_RESULT           res = AMF_OK;
+    AMF_RESULT         res;
     enum AVPixelFormat pix_fmt;
 
     switch (avctx->codec->id) {
@@ -361,8 +356,8 @@ static int amf_init_encoder(AVCodecContext *avctx)
 int av_cold ff_amf_encode_close(AVCodecContext *avctx)
 {
     AmfContext *ctx = avctx->priv_data;
-    if (ctx->delayed_surface)
-    {
+
+    if (ctx->delayed_surface) {
         ctx->delayed_surface->pVtbl->Release(ctx->delayed_surface);
         ctx->delayed_surface = NULL;
     }
@@ -402,7 +397,7 @@ int av_cold ff_amf_encode_close(AVCodecContext *avctx)
 static int amf_copy_surface(AVCodecContext *avctx, const AVFrame *frame,
     AMFSurface* surface)
 {
-    AMFPlane       *plane = NULL;
+    AMFPlane *plane;
     uint8_t  *dst_data[4];
     int       dst_linesize[4];
     int       planes;
@@ -497,21 +492,8 @@ static int amf_copy_buffer(AVCodecContext *avctx, AVPacket *pkt, AMFBuffer *buff
 // amfenc API implementation
 int ff_amf_encode_init(AVCodecContext *avctx)
 {
-    AmfContext     *ctx = avctx->priv_data;
     int ret;
 
-    ctx->factory = NULL;
-    ctx->debug = NULL;
-    ctx->trace = NULL;
-    ctx->context = NULL;
-    ctx->encoder = NULL;
-    ctx->library = NULL;
-    ctx->version = 0;
-    ctx->eof = 0;
-    ctx->format = 0;
-    ctx->tracer.vtbl = NULL;
-    ctx->tracer.avctx = NULL;
-
     if ((ret = amf_load_library(avctx)) == 0) {
         if ((ret = amf_init_context(avctx)) == 0) {
             if ((ret = amf_init_encoder(avctx)) == 0) {
@@ -587,17 +569,17 @@ static AMFBuffer *amf_create_buffer_with_frame_ref(const AVFrame *frame, AMFCont
 
 static void amf_release_buffer_with_frame_ref(AMFBuffer *frame_ref_storage_buffer)
 {
-    AVFrame *av_frame_ref;
-    memcpy(&av_frame_ref, frame_ref_storage_buffer->pVtbl->GetNative(frame_ref_storage_buffer), sizeof(av_frame_ref));
-    av_frame_free(&av_frame_ref);
+    AVFrame *frame_ref;
+    memcpy(&frame_ref, frame_ref_storage_buffer->pVtbl->GetNative(frame_ref_storage_buffer), sizeof(frame_ref));
+    av_frame_free(&frame_ref);
     frame_ref_storage_buffer->pVtbl->Release(frame_ref_storage_buffer);
 }
 
 int ff_amf_send_frame(AVCodecContext *avctx, const AVFrame *frame)
 {
-    AMF_RESULT      res = AMF_OK;
     AmfContext *ctx = avctx->priv_data;
-    AMFSurface     *surface = NULL;
+    AMFSurface *surface;
+    AMF_RESULT  res;
     int         ret;
 
     if (!ctx->encoder)