[roll] Roll fuchsia [zircon][ktrace] Check the required buffer size before copying Ktrace requires a minimum buffer size to copy data, so we should first check the size of the buffer we need to allocate. Test: ``` fx shell ktrace start 0xfff sleep 5 fx shell ktrace stop fx shell ktrace save /tmp/ktrace.fxt fx cp --to-host /tmp/ktrace.fxt ktrace.fxt ``` Now produces a readable trace. Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1662476 Original-Original-Revision: bd2ce6d9d4449f67a857bf6183cc73bac1fa25ac GitOrigin-RevId: 3a87b4bc267152d76ee99fd30b133e1dc5c179aa Change-Id: I8369035ad13e01c1b05f5694b3f343650287d7fe Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1662948 Cr-Commit-Position: refs/heads/main@{#195028}
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