pythonGH-131296: Fix incompatible pointer type warning in _winapi.c (pythonGH-131600)

Author: chris-eibl

Modules/_winapi.c

@@ -609,7 +609,7 @@ _winapi_CreateJunction_impl(PyObject *module, LPCWSTR src_path,
         /* overallocate by a few array elements */
         LUID_AND_ATTRIBUTES privs[4];
     } tp, previousTp;
-    int previousTpSize = 0;
+    DWORD previousTpSize = 0;
 
     /* Reparse data buffer */
     const USHORT prefix_len = 4;