media/gpu/v4l2svda: fix typo

We want to check for the newly created wrapped_frame here.

BUG=None
TEST=VDAtest passes on Kevin in debug mode.

Change-Id: Ibac097a0b335369a489b5aef360cf1463e8d0b7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975474
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726733}

media/gpu/v4l2/v4l2_slice_video_decode_accelerator.cc

@@ -2249,7 +2249,7 @@ bool V4L2SliceVideoDecodeAccelerator::ProcessFrame(
     scoped_refptr<VideoFrame> wrapped_frame = VideoFrame::WrapVideoFrame(
         output_frame, output_frame->format(), output_frame->visible_rect(),
         output_frame->coded_size());
-    DCHECK(output_frame != nullptr);
+    DCHECK(wrapped_frame);
 
     image_processor_->Process(
         std::move(input_frame), std::move(wrapped_frame),