tools: ynl-gen: add missing request free helpers for dumps

The code gen generates a prototype for dump request free
in the header, but no implementation in the source.
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20231213231432.2944749-2-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/ynl-gen-c.py

@@ -2771,6 +2771,7 @@ def main():
                     ri = RenderInfo(cw, parsed, args.mode, op, "dump")
                     if not ri.type_consistent:
                         parse_rsp_msg(ri, deref=True)
+                    print_req_free(ri)
                     print_dump_type_free(ri)
                     print_dump(ri)
                     cw.nl()