gh-117376: Fix off-by-ones in conversion functions (GH-124301)

Fix off-by-ones in conversion function

Author: Fidget-Spinner

Python/bytecodes.c

@@ -3928,7 +3928,7 @@ dummy_func(
             PyCFunctionFastWithKeywords cfunc =
                 (PyCFunctionFastWithKeywords)(void(*)(void))meth->ml_meth;
 
-            STACKREFS_TO_PYOBJECTS(args, nargs, args_o);
+            STACKREFS_TO_PYOBJECTS(args, total_args, args_o);
             if (CONVERSION_FAILED(args_o)) {
                 DECREF_INPUTS();
                 ERROR_IF(true, error);
@@ -4009,7 +4009,7 @@ dummy_func(
                 (PyCFunctionFast)(void(*)(void))meth->ml_meth;
             int nargs = total_args - 1;
 
-            STACKREFS_TO_PYOBJECTS(args, nargs, args_o);
+            STACKREFS_TO_PYOBJECTS(args, total_args, args_o);
             if (CONVERSION_FAILED(args_o)) {
                 DECREF_INPUTS();
                 ERROR_IF(true, error);