fix: checkptr issue #27
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When use >= go1.14, the go will return the issue, like
```
checkptr: converted pointer straddles multiple allocations
goroutine 27 [running]:
runtime.throw(0xf8de9c, 0x3a)
/usr/local/go/src/runtime/panic.go:1116 +0x72 fp=0xc0004afd80 sp=0xc0004afd50 pc=0x6ac9f2
runtime.checkptrAlignment(0xc0004afe78, 0xeabac0, 0x1)
/usr/local/go/src/runtime/checkptr.go:20 +0xc9 fp=0xc0004afdb0 sp=0xc0004afd80 pc=0x67baa9
github.com/containerd/containerd/vendor/github.com/containerd/btrfs.SubvolCreate(0xc0001b2040, 0x31, 0x0, 0x0)
/root/go/src/github.com/containerd/containerd/vendor/github.com/containerd/btrfs/btrfs.go:278 +0x185 fp=0xc0004b0ea8 sp=0xc0004afdb0 pc=0x899e45
github.com/containerd/containerd/snapshots/btrfs.(*snapshotter).makeSnapshot(0xc0005322d0, 0x1042c40, 0xc00018a360, 0x2, 0xf6e78e, 0x4, 0x0, 0x0, 0xc00053c040, 0x1, ...)
/root/go/src/github.com/containerd/containerd/snapshots/btrfs/btrfs.go:216 +0x386 fp=0xc0004b13b0 sp=0xc0004b0ea8 pc=0xe2a646
github.com/containerd/containerd/snapshots/btrfs.(*snapshotter).Prepare(0xc0005322d0, 0x1042c40, 0xc000020180, 0xf6e78e, 0x4, 0x0, 0x0, 0xc00053c040, 0x1, 0x1, ...)
/root/go/src/github.com/containerd/containerd/snapshots/btrfs/btrfs.go:186 +0xd0 fp=0xc0004b1468 sp=0xc0004b13b0 pc=0xe2a050
github.com/containerd/containerd/snapshots/testsuite.baseTestSnapshots(0x1042c40, 0xc000020180, 0x1047ec0, 0xc0005322d0, 0x6be694, 0xc0005443e9)
/root/go/src/github.com/containerd/containerd/snapshots/testsuite/testsuite.go:563 +0x11a fp=0xc0004b15b8 sp=0xc0004b1468 pc=0xe1951a
github.com/containerd/containerd/snapshots/testsuite.checkUpdate(0x1042c40, 0xc000020180, 0xc000083e00, 0x1047ec0, 0xc0005322d0, 0xc00052c300, 0x28)
/root/go/src/github.com/containerd/containerd/snapshots/testsuite/testsuite.go:592 +0x125 fp=0xc0004b1c30 sp=0xc0004b15b8 pc=0xe1a065
github.com/containerd/containerd/snapshots/testsuite.makeTest.func1(0xc000083e00)
/root/go/src/github.com/containerd/containerd/snapshots/testsuite/testsuite.go:117 +0x72e fp=0xc0004b1ed0 sp=0xc0004b1c30 pc=0xe244ee
testing.tRunner(0xc000083e00, 0xc000149590)
/usr/local/go/src/testing/testing.go:1123 +0x203 fp=0xc0004b1fd0 sp=0xc0004b1ed0 pc=0x819ba3
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0004b1fd8 sp=0xc0004b1fd0 pc=0x6e6401
created by testing.(*T).Run
/usr/local/go/src/testing/testing.go:1168 +0x5bc
```
Should use (*[x]T)(ptr)[:n:m] to prevent the issue.
Reference: etcd-io/bbolt#187 (comment)
Signed-off-by: Wei Fu <fuweid89@gmail.com>
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When use >= go1.14, the go will return the issue, like
Should use (*[x]T)(ptr)[:n:m] to prevent the issue.
Reference: etcd-io/bbolt#187 (comment)
Signed-off-by: Wei Fu fuweid89@gmail.com