Merge pull request libgit2#4344 from slavikus/fix-dirty-buffer-in-git-push-update-tips

Clear the remote_ref_name buffer in git_push_update_tips()

Author: ethomson

src/push.c

@@ -178,6 +178,9 @@ int git_push_update_tips(git_push *push, const git_remote_callbacks *callbacks)
 		if (!fetch_spec)
 			continue;
 
+		/* Clear the buffer which can be dirty from previous iteration */
+		git_buf_clear(&remote_ref_name);
+
 		if ((error = git_refspec_transform(&remote_ref_name, fetch_spec, status->ref)) < 0)
 			goto on_error;