hw/ide/ahci: Clean up local variable shadowing

hw/ide/ahci: Clean up local variable shadowing

Fix:

  hw/ide/ahci.c:1577:23: error: declaration shadows a local variable [-Werror,-Wshadow]
            IDEState *s = &ad->port.ifs[j];
                      ^
  hw/ide/ahci.c:1569:29: note: previous declaration is here
    void ahci_uninit(AHCIState *s)
                                ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231004120019.93101-3-philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>