convert : remove redundant code (#15708) #7

Job	Run time
macOS-arm64	1m 52s
macOS-x64	4m 6s
windows-cuda (12.4)	44m 53s
ubuntu-22-vulkan	7m 20s
windows (opencl-adreno, arm64, -G "Ninja Multi-Config" -D CMAKE_TOOLCHAIN_FILE=cmake/arm64-window...	2m 42s
ubuntu-22-cpu (x64, ubuntu-22.04)	3m 45s
ios-xcode-build	17m 28s
windows-hip (radeon, gfx1100;gfx1101;gfx1102;gfx1030;gfx1031;gfx1032)	45m 23s
windows (vulkan, x64, -DGGML_VULKAN=ON, ggml-vulkan)	4m 7s
windows-sycl	12m 57s
windows-cpu (x64)	3m 41s
windows-cpu (arm64)	2m 43s
release	1m 8s
	2h 32m 5s

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