Merge pull request #798 from filecoin-project/fix/worker-taux

Fix worker t_aux errors

extern/filecoin-ffi

@@ -1 +1 @@
-Subproject commit fe188cfa1e082e4c41cadeb17a3a7c9e43ae6f03
+Subproject commit 16a8b663ec61339d3d8736e85eddd3e4a1c190b7

lib/tarutil/systar.go

@@ -38,6 +38,10 @@ func ExtractTar(body io.Reader, dir string) error {
 		if _, err := io.Copy(f, tr); err != nil {
 			return err
 		}
+
+		if err := f.Close(); err != nil {
+			return err
+		}
 	}
 }