hw/nios2: Clean up local variable shadowing

hw/nios2: Clean up local variable shadowing

Fix:

  hw/nios2/10m50_devboard.c: In function ‘nios2_10m50_ghrd_init’:
  hw/nios2/10m50_devboard.c:101:22: warning: declaration of ‘dev’ shadows a previous local [-Wshadow=compatible-local]
    101 |         DeviceState *dev = qdev_new(TYPE_NIOS2_VIC);
        |                      ^~~
  hw/nios2/10m50_devboard.c:60:18: note: shadowed declaration is here
     60 |     DeviceState *dev;
        |                  ^~~

  hw/nios2/10m50_devboard.c:110:18: warning: declaration of ‘i’ shadows a previous local [-Wshadow=compatible-local]
    110 |         for (int i = 0; i < 32; i++) {
        |                  ^
  hw/nios2/10m50_devboard.c:67:9: note: shadowed declaration is here
     67 |     int i;
        |         ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-15-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>