dbdma: Set queue_len after all other fields. #1251

Job	Run time
build-windows-msys2	2m 55s
build-linux	1m 38s
build-macos (macos-latest, arm64, /opt/homebrew)	1m 22s
build-windows-vsbuild (msbuild, Ninja, -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl, -DCMAKE_C_C...	2m 43s
build-windows-vsbuild (msvc, Ninja, -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNC...	2m 42s
build-windows-vsbuild (clang, Ninja, -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl, -...	2m 43s
build-macos (macos-15-intel, x86_64, /usr/local)	3m 5s
build-windows-vsbuild (msvc, Ninja, -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNC...	4m 58s
build-windows-msys2	3m 16s
build-windows-vsbuild (clang, Ninja, -DCMAKE_C_COMPILER=clang-cl -DCMAKE_CXX_COMPILER=clang-cl, -...	4m 56s
build-macos (macos-15-intel, x86_64, /usr/local)	3m 28s
build-windows-vsbuild (msbuild, Ninja, -DCMAKE_C_COMPILER=cl -DCMAKE_CXX_COMPILER=cl, -DCMAKE_C_C...	4m 14s
build-linux	1m 38s
build-macos (macos-latest, arm64, /opt/homebrew)	1m 22s
	41m 0s

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