Fix code scanning alert no. 42: Incorrect conversion between integer types #5944

Job	Run time
Lints	2m 22s
Integration tests	14m 17s
Integration tests (on Linux) (alpine.yaml)	6m 18s
Integration tests (on Linux) (debian.yaml)	6m 24s
Integration tests (on Linux) (fedora.yaml)	7m 32s
Integration tests (on Linux) (opensuse.yaml)	8m 46s
Integration tests (on Linux) (experimental/net-user-v2.yaml)	7m 55s
Integration tests (on Linux) (experimental/9p.yaml)	6m 40s
Integration tests (on Linux) (docker.yaml)	7m 27s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 39s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 14s
Unit tests (1.22.x)	58s
Unit tests (1.23.x)	4m 4s
Windows tests	5m 33s
Colima (v0.6.5)	6m 33s
Upgrade test (v0.15.1)	11m 15s
VMNet test	11m 33s
vz (default.yaml)	10m 25s
vz (fedora.yaml)	9m 8s
	2h 32m 3s

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