avutil/hwcontext_d3d11va: Free AVD3D11FrameDescriptor on error

Fixes: CID1598558 Resource leak

Sponsored-by: Sovereign Tech Fund
Reviewed-by: Steve Lhomme <robux4@ycbcr.xyz>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit cf22f944d5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/hwcontext_d3d11va.c

@@ -189,6 +189,7 @@ static AVBufferRef *wrap_texture_buf(AVHWFramesContext *ctx, ID3D11Texture2D *te
                                                    sizeof(*frames_hwctx->texture_infos));
         if (!frames_hwctx->texture_infos) {
             ID3D11Texture2D_Release(tex);
+            av_free(desc);
             return NULL;
         }
         s->nb_surfaces = s->nb_surfaces_used + 1;