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/blobstore.go

@@ -121,7 +121,6 @@ func (bs *blobStore) path(dgst digest.Digest) (string, error) {
 	bp, err := pathFor(blobDataPathSpec{
 		digest: dgst,
 	})
-
 	if err != nil {
 		return "", err
 	}
@@ -165,7 +164,6 @@ func (bs *blobStatter) Stat(ctx context.Context, dgst digest.Digest) (distributi
 	path, err := pathFor(blobDataPathSpec{
 		digest: dgst,
 	})
-
 	if err != nil {
 		return distribution.Descriptor{}, err
 	}