I think this was there for historic reasons (may have been goimports expected
this, and we used to have a linter that wanted it), but it's not needed, so
let's remove it (to make my IDE less complaining about unneeded aliases).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
```
builder/builder-next/adapters/containerimage/pull.go:278:23: Error return value of `resolveProgressDone` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:286:24: Error return value of `resolveProgressDone` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:303:24: Error return value of `resolveProgressDone` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:309:24: Error return value of `resolveProgressDone` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:315:22: Error return value of `resolveProgressDone` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:512:14: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:675:13: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:700:14: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:786:10: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/adapters/containerimage/pull.go:791:11: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/exporter/export.go:133:13: Error return value of `layersDone` is not checked (errcheck)
builder/builder-next/exporter/export.go:163:12: Error return value of `configDone` is not checked (errcheck)
builder/builder-next/exporter/export.go:172:11: Error return value of `tagDone` is not checked (errcheck)
builder/builder-next/exporter/writer.go:207:10: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/exporter/writer.go:212:11: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/worker/worker.go:397:6: Error return value of `done` is not checked (errcheck)
builder/builder-next/worker/worker.go:446:10: Error return value of `pw.Write` is not checked (errcheck)
builder/builder-next/worker/worker.go:451:11: Error return value of `pw.Write` is not checked (errcheck)
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
