vz: fix nil pointer dereference with mountType: reverse-sshfs; validate disk format
#1245
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```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x10075a5a4]
goroutine 1 [running]:
github.com/Code-Hex/vz/v3/internal/objc.ConvertToNSMutableArray.func1(0x2?, 0x600000c143f0?)
/Users/suda/gopath/pkg/mod/github.com/!code-!hex/vz/[email protected]/internal/objc/objc.go:134 +0x24
github.com/Code-Hex/vz/v3/internal/objc.ConvertToNSMutableArray({0xc0002c85c0, 0x2, 0xc0001fdb20?})
/Users/suda/gopath/pkg/mod/github.com/!code-!hex/vz/[email protected]/internal/objc/objc.go:134 +0xef
github.com/Code-Hex/vz/v3.(*VirtualMachineConfiguration).SetDirectorySharingDevicesVirtualMachineConfiguration(0xc00012e000?, {0xc0002c85a0, 0x2, 0x1f?})
/Users/suda/gopath/pkg/mod/github.com/!code-!hex/vz/[email protected]/configuration.go:188 +0x77
github.com/lima-vm/lima/pkg/vz.attachFolderMounts(0xc00047e780, 0xb?)
/Users/suda/gopath/src/github.com/lima-vm/lima/pkg/vz/vm_darwin.go:381 +0x214
github.com/lima-vm/lima/pkg/vz.createVM(0x1000811e5?, 0xc00012e040?)
/Users/suda/gopath/src/github.com/lima-vm/lima/pkg/vz/vm_darwin.go:124 +0xf8
github.com/lima-vm/lima/pkg/vz.startVM({0x100b42d30?, 0xc0000da008}, 0xc00047e780)
/Users/suda/gopath/src/github.com/lima-vm/lima/pkg/vz/vm_darwin.go:32 +0x5b
github.com/lima-vm/lima/pkg/vz.(*LimaVzDriver).Start(0xc0004b62b0, {0x100b42d30, 0xc0000da008})
/Users/suda/gopath/src/github.com/lima-vm/lima/pkg/vz/vz_driver_darwin.go:106 +0xf3
github.com/lima-vm/lima/pkg/hostagent.(*HostAgent).Run(0xc0000e0480, {0x100b42d30?, 0xc0000da008})
/Users
```
Signed-off-by: Akihiro Suda <[email protected]>
Signed-off-by: Akihiro Suda <[email protected]>
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