Fix another git2go import line.

Change-Id: Ic49b168e18c25f90a83291532bf356c3cc008967

fs/nodecache.go

diff --git a/fs/nodecache.go b/fs/nodecache.go
index 2b94e85..ad7e206 100644
--- a/fs/nodecache.go
+++ b/fs/nodecache.go
@@ -17,7 +17,7 @@
 import (
 	"sync"
 
-	"github.com/libgit2/git2go"
+	git "github.com/libgit2/git2go"
 )
 
 type nodeCacheKey struct {