format code with gofumpt

gofumpt (https://github.com/mvdan/gofumpt) provides a supserset of `gofmt` / `go fmt`,
and addresses various formatting issues that linters may be checking for.

We can consider enabling the `gofumpt` linter to verify the formatting in CI, although
not every developer may have it installed, so for now this runs it once to get formatting
in shape.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/storage/blobwriter_resumable.go

@@ -85,7 +85,6 @@ func (bw *blobWriter) getStoredHashStates(ctx context.Context) ([]hashStateEntry
 		alg:  bw.digester.Digest().Algorithm(),
 		list: true,
 	})
-
 	if err != nil {
 		return nil, err
 	}
@@ -136,7 +135,6 @@ func (bw *blobWriter) storeHashState(ctx context.Context) error {
 		alg:    bw.digester.Digest().Algorithm(),
 		offset: bw.written,
 	})
-
 	if err != nil {
 		return err
 	}