Cleanup: move Python's GIL ensure/release to the function start/end

Avoid errors accessing state without the GIL (#127767) by moving
GIL ensure/release to the star/end of the function body.

source/blender/python/intern/bpy_cli_command.cc

@@ -62,10 +62,11 @@ static int bpy_cli_command_exec(bContext *C,
                                 const int argc,
                                 const char **argv)
 {
-  int exit_code = EXIT_FAILURE;
   PyGILState_STATE gilstate;
   bpy_context_set(C, &gilstate);
 
+  int exit_code = EXIT_FAILURE;
+
   /* For the most part `sys.argv[-argc:]` is sufficient & less trouble than re-creating this
    * list. Don't do this because:
    * - Python scripts *could* have manipulated `sys.argv` (although it's bad practice).