all: remove duplicate imports

Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>

cache/remotecache/registry/registry.go

@@ -13,7 +13,6 @@ import (
 	"github.com/moby/buildkit/util/resolver"
 	"github.com/moby/buildkit/util/resolver/limited"
 	digest "github.com/opencontainers/go-digest"
-	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
@@ -94,7 +93,7 @@ func (dsl *withDistributionSourceLabel) SetDistributionSourceLabel(ctx context.C
 	if err != nil {
 		return err
 	}
-	_, err = hf(ctx, ocispec.Descriptor{Digest: dgst})
+	_, err = hf(ctx, specs.Descriptor{Digest: dgst})
 	return err
 }
 

cmd/buildkitd/main.go

@@ -66,7 +66,6 @@ import (
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	"go.opentelemetry.io/otel/trace"
 	tracev1 "go.opentelemetry.io/proto/otlp/collector/trace/v1"
-	v1 "go.opentelemetry.io/proto/otlp/collector/trace/v1"
 	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc"
 )
@@ -805,5 +804,5 @@ func (t *traceCollector) Export(ctx context.Context, req *tracev1.ExportTraceSer
 	if err != nil {
 		return nil, err
 	}
-	return &v1.ExportTraceServiceResponse{}, nil
+	return &tracev1.ExportTraceServiceResponse{}, nil
 }

control/control.go

@@ -27,7 +27,6 @@ import (
 	"github.com/pkg/errors"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	tracev1 "go.opentelemetry.io/proto/otlp/collector/trace/v1"
-	v1 "go.opentelemetry.io/proto/otlp/collector/trace/v1"
 	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
@@ -203,7 +202,7 @@ func (c *Controller) Export(ctx context.Context, req *tracev1.ExportTraceService
 	if err != nil {
 		return nil, err
 	}
-	return &v1.ExportTraceServiceResponse{}, nil
+	return &tracev1.ExportTraceServiceResponse{}, nil
 }
 
 func translateLegacySolveRequest(req *controlapi.SolveRequest) error {