unit-test: bugs on a few unit tests on aarch64

[Pennyzct]

Description of problem

09:55:00 cli/kata-check_arm64.go:129:9:warning: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary) (golint)
09:55:02 virtcontainers/qemu_arm64_test.go:43:23:warning: unused variable or constant undeclared name: virt (varcheck)
09:55:02 virtcontainers/qemu_arm64_test.go:50:11:warning: unused variable or constant undeclared name: defaultMemSlots (varcheck)
09:55:02 virtcontainers/qemu_arm64_test.go:54:40:warning: unused variable or constant too few arguments in call to arm64.memoryTopology (varcheck)
09:55:02 virtcontainers/qemu_arm64_test.go:29:23:warning: unused variable or constant undeclared name: virt (varcheck)
09:55:02 cli/kata-check_test.go:141:113:warning: unused variable or constant undeclared name: TestDataa (varcheck)
09:55:03 virtcontainers/qemu_arm64_test.go:43:23:warning: unused struct field undeclared name: virt (structcheck)
09:55:03 virtcontainers/qemu_arm64_test.go:50:11:warning: unused struct field undeclared name: defaultMemSlots (structcheck)
09:55:03 virtcontainers/qemu_arm64_test.go:54:40:warning: unused struct field too few arguments in call to arm64.memoryTopology (structcheck)
09:55:03 virtcontainers/qemu_arm64_test.go:29:23:warning: unused struct field undeclared name: virt (structcheck)
09:55:03 cli/kata-check_test.go:141:113:warning: unused struct field undeclared name: TestDataa (structcheck)
09:55:03 cli/kata-check_test.go:141:113:warning: undeclared name: TestDataa (unused)
09:55:04 cli/kata-check_test.go:141:113:warning: undeclared name: TestDataa (staticcheck)
09:55:05 Build step 'Execute shell' marked build as failure

There existed some bugs on a few unit tests on aarch64, and I will fix them asap.
During the time, In case ARM CI blocks other PRs, please bring it down temporarily.
@grahamwhaley @jodh-intel