Minimize casts to pointers #1892

Job	Run time
Check	55s
Clippy	1m 27s
Check docs	29s
Build	1m 58s
Format	28s
Run Hermit for Rust (x86_64 + kvm)	4m 5s
Run (x86_64, rusty_demo, none, dev)	3m 28s
Test	1m 38s
Run (x86_64, rusty_demo, none, release)	3m 50s
Run (x86_64, httpd, virtio-net-pci, dev)	2m 31s
Run (x86_64, httpd, virtio-net-pci, release)	2m 52s
Run (x86_64, httpd, rtl8139, dev)	3m 3s
Run (x86_64, httpd, rtl8139, release)	3m 41s
Run (x86_64, testudp, virtio-net-pci, dev)	3m 22s
Run (x86_64, testudp, virtio-net-pci, release)	3m 5s
Run (x86_64, testudp, rtl8139, dev)	3m 7s
Run (x86_64, testudp, rtl8139, release)	3m 7s
Run (x86_64, hello_world, none, dev)	2m 23s
Run (x86_64, hello_world, none, release)	2m 30s
Run (aarch64, rusty_demo, none, dev)	3m 26s
Run (aarch64, rusty_demo, none, release)	3m 18s
Run (aarch64, httpd, virtio-net-pci, dev)	2m 55s
Run (aarch64, httpd, virtio-net-pci, release)	3m 3s
Run (aarch64, testudp, virtio-net-pci, dev)	2m 47s
Run (aarch64, testudp, virtio-net-pci, release)	2m 47s
	1h 6m 15s

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