Fix bug

Author: lunny

routers/web/repo/compare.go

@@ -407,7 +407,7 @@ func ParseCompareInfo(ctx *context.Context) *common.CompareInfo {
 			ctx.ServerError("OpenRepository", err)
 			return nil
 		}
-		defer ci.HeadGitRepo.Close()
+		// if it's not the same git repo, the HeadGitRepo should be closed out of the function
 	} else {
 		ctx.NotFound(nil)
 		return nil
@@ -727,7 +727,8 @@ func getBranchesAndTagsForRepo(ctx gocontext.Context, repo *repo_model.Repositor
 func CompareDiff(ctx *context.Context) {
 	ci := ParseCompareInfo(ctx)
 	defer func() {
-		if ci != nil && ci.HeadGitRepo != nil {
+		// If it's the same repo, the git repo should be managed by the context
+		if !ctx.Repo.PullRequest.SameRepo && ci != nil && ci.HeadGitRepo != nil {
 			ci.HeadGitRepo.Close()
 		}
 	}()

routers/web/repo/pull.go

@@ -1297,7 +1297,7 @@ func CompareAndPullRequestPost(ctx *context.Context) {
 
 	ci := ParseCompareInfo(ctx)
 	defer func() {
-		if ci != nil && ci.HeadGitRepo != nil {
+		if !ctx.Repo.PullRequest.SameRepo && ci != nil && ci.HeadGitRepo != nil {
 			ci.HeadGitRepo.Close()
 		}
 	}()