Fix gptel-cpp-complete--get-treesit-extra-load-path not working.

Author: beacoder

gptel-cpp-complete.el

@@ -95,9 +95,8 @@
 ;; ------------------------------------------------------------
 (defun gptel-cpp-complete--get-treesit-extra-load-path ()
   "Get `treesiter' extra load path."
-  (list (expand-file-name
-         "./" (file-name-directory
-               (or load-file-name (buffer-file-name))))))
+  (when-let ((lib (locate-library "gptel-cpp-complete")))
+    (list (file-name-directory lib))))
 
 (defmacro gptel-cpp-complete--with-which-function-mode (&rest body)
   "Execute BODY with `which-function-mode' enabled, then restore original state."