aspeed: Clean up local variable shadowing

aspeed: Clean up local variable shadowing

Remove superfluous local 'irq' variables and use the one define at the
top of the routine. This fixes warnings in aspeed_soc_ast2600_realize()
such as :

  ../hw/arm/aspeed_ast2600.c: In function ‘aspeed_soc_ast2600_realize’:
  ../hw/arm/aspeed_ast2600.c:420:18: warning: declaration of ‘irq’ shadows a previous local [-Wshadow=compatible-local]
    420 |         qemu_irq irq = aspeed_soc_get_irq(s, ASPEED_DEV_TIMER1 + i);
        |                  ^~~
  ../hw/arm/aspeed_ast2600.c:312:14: note: shadowed declaration is here
    312 |     qemu_irq irq;
        |              ^~~

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-ID: <20230922155924.1172019-3-clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>