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Revert back to reflect.Ptr#182
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This allows the module to be compiled using go 1.14, as specified in the go.mod file.
The `WatchDeviceChanges` function creates a goroutine that watches for any change notifications coming from the underlying Device. The result of `b.Parse` is sent to the channel `ch` using a blocking send. Because of this, the caller to `WatchDeviceChanges` must continuously empty this channel otherise the goroutine will simply hang on this line, meaning it will never exit and result in a goroutine leak. So the caller code looks something like this:
```go
ch, err := b.WatchDeviceChanges(ctx)
if err != nil {
...
}
// Make sure to empty the channel
go func() {
for range ch {}
}()
```
This brings us onto the second issue: the channel `ch` is only closed when the context `ctx` is done. However, the goroutine can also exit due to `b.propchanged` sending a `nil`, which occurs when `UnwatchDeviceChanges` is called. In this case, `ch` is never closed, which means the caller to `WatchDeviceChanges` that is emptying `ch` will never quit, again resulting in a goroutine and channel leak. Closing the channel using a `defer` at the beginning of the goroutine resolves this issue.
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This allows the module to be compiled using Go 1.14, as specified in the go.mod file.
reflect.Ptrwas renamed toreflect.Pointerin Go 1.18 (see https://tip.golang.org/doc/go1.18). The code usesreflect.Pointerdespite the go.mod file specifying a minimum Go version of 1.14. So either the go.mod file needs to be updated or the code should revert back toreflect.Ptrfor as long as Go 1.14 is considered the minimum required version.