Fix: use correct accessor to write pointer

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/capi.c

@@ -663,6 +663,11 @@ PyAPI_FUNC(int) WriteObjectMember(void* object, Py_ssize_t offset, PyObject* val
     return 0;
 }
 
+PyAPI_FUNC(int) WritePointerMember(void* object, Py_ssize_t offset, void* value) {
+    WriteMember(object, offset, value, void*);
+    return 0;
+}
+
 PyAPI_FUNC(int) WriteCharMember(void* object, Py_ssize_t offset, char value) {
     WriteMember(object, offset, value, char);
     return 0;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/NativeCAPISymbol.java

@@ -106,6 +106,7 @@ public enum NativeCAPISymbol implements NativeCExtSymbol {
     FUN_WRITE_STRING_MEMBER("WriteStringMember", Int, Pointer, Py_ssize_t, ConstCharPtr),
     FUN_WRITE_STRING_IN_PLACE_MEMBER("WriteStringInPlaceMember", Int, Pointer, Py_ssize_t, ConstCharPtr),
     FUN_WRITE_OBJECT_MEMBER("WriteObjectMember", Int, Pointer, Py_ssize_t, Pointer),
+    FUN_WRITE_POINTER_MEMBER("WritePointerMember", Int, Pointer, Py_ssize_t, Pointer),
     FUN_WRITE_OBJECT_EX_MEMBER("WriteObjectExMember", Int, Pointer, Py_ssize_t, Pointer),
     FUN_WRITE_CHAR_MEMBER("WriteCharMember", Int, Pointer, Py_ssize_t, Int),
     FUN_WRITE_UBYTE_MEMBER("WriteUByteMember", Int, Pointer, Py_ssize_t, Int),

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/structs/CStructAccess.java

@@ -1196,7 +1196,7 @@ static void writeManaged(Object pointer, long offset, Object value,
                         @SuppressWarnings("unused") @CachedLibrary(limit = "3") InteropLibrary lib,
                         @Cached PCallCapiFunction call) {
             assert validPointer(pointer);
-            call.call(NativeCAPISymbol.FUN_WRITE_LONG_MEMBER, pointer, offset, value);
+            call.call(NativeCAPISymbol.FUN_WRITE_POINTER_MEMBER, pointer, offset, value);
         }
 
         public static WritePointerNode getUncached() {