fixup! gh-142776: Ensure fp file descriptor is closed on all code paths in import.c

Address review comments and add a NEWS entry

Author: stratakis

Misc/NEWS.d/next/Core_and_Builtins/2025-12-18-01-00-14.gh-issue-142776.ACaoeP.rst

@@ -0,0 +1 @@
+Fix a file descriptor leak in import.c

Python/import.c

@@ -4843,7 +4843,7 @@ _imp_create_dynamic_impl(PyObject *module, PyObject *spec, PyObject *file)
 #endif
 
 finally:
-    if (fp) {
+    if (fp != NULL) {
         fclose(fp);
     }
     _Py_ext_module_loader_info_clear(&info);