fix: apply pre-conditions first on object metadata (#12545)

This change in error flow complies with AWS S3 behavior
for applications depending on specific error conditions.

fixes #12543

cmd/disk-cache-backend.go

@@ -963,7 +963,7 @@ func (c *diskCache) Get(ctx context.Context, bucket, object string, rs *HTTPRang
 	// case of incomplete read.
 	pipeCloser := func() { pr.CloseWithError(nil) }
 
-	gr, gerr := fn(pr, h, opts.CheckPrecondFn, pipeCloser)
+	gr, gerr := fn(pr, h, pipeCloser)
 	if gerr != nil {
 		return gr, numHits, gerr
 	}