Remove unnecessary cast in cabi_dealloc #2358

Job	Run time
Rustfmt	7s
Check	1m 45s
Build wit-bindgen (x86_64-linux, ubuntu-latest)	2m 2s
Test (ubuntu-latest, c)	4m 11s
Build wit-bindgen (x86_64-macos, macos-latest, x86_64-apple-darwin)	1m 15s
Test (ubuntu-latest, rust)	4m 34s
Crate Unit Tests	53s
Build wit-bindgen (aarch64-macos, macos-latest, aarch64-apple-darwin)	1m 27s
verify-publish	1m 54s
Test (ubuntu-latest, teavm-java)	4m 37s
Build wit-bindgen (x86_64-windows, windows-latest)	4m 13s
Test (ubuntu-latest, go)	5m 26s
Build wit-bindgen (aarch64-linux, ubuntu-latest, aarch64-unknown-linux-gnu)	1m 48s
Test (ubuntu-latest, csharp)	7m 30s
Test (macos-latest, c)	3m 21s
Test (macos-latest, rust)	4m 52s
Test (macos-latest, teavm-java)	6m 35s
Test (macos-latest, go)	3m 47s
Test (macos-latest, csharp)	4m 39s
Test (windows-latest, c)	8m 45s
Test (windows-latest, rust)	9m 46s
Test (windows-latest, teavm-java)	9m 42s
Test (windows-latest, go)	10m 24s
Test (windows-latest, csharp)	33m 2s
Record the result of testing and building steps	1s
	2h 16m 36s

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