Fix use-after-move in //components/services/paint_preview_compositor/

Fix use-after-move (potential) bugs found by the
"bugprone-use-after-move" clang-tidy check.

Bug: 1122844
Change-Id: Iecad2dc339be6d352c3cf420a50b3f9c58cbe68f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382594
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803099}

components/services/paint_preview_compositor/paint_preview_compositor_impl.cc

@@ -144,6 +144,7 @@ void PaintPreviewCompositorImpl::BeginSeparatedFrameComposite(
     std::move(callback).Run(mojom::PaintPreviewCompositor::
                                 BeginCompositeStatus::kDeserializingFailure,
                             std::move(response));
+    return;
   }
   auto frames = DeserializeAllFrames(std::move(request->recording_map));
 
@@ -216,6 +217,7 @@ void PaintPreviewCompositorImpl::BeginMainFrameComposite(
     DVLOG(1) << "No valid root frame guid";
     std::move(callback).Run(mojom::PaintPreviewCompositor::
                                 BeginCompositeStatus::kDeserializingFailure);
+    return;
   }
 
   base::flat_map<base::UnguessableToken, sk_sp<SkPicture>> loaded_frames;