hw/arm/aspeed_ast27x0-fc: Drop dead return checks

hw/arm/aspeed_ast27x0-fc: Drop dead return checks

1. object_property_set_link() can return false only when it fails, and it
sets an error when it fails. Since passing &error_abort causes an abort,
the function never returns false, and the return statement is effectively
dead code.
2. object_property_set_int() is considered as a routine which shouldn't fail.
So the common practice in models is to pass &error_abort and ignore the returned value.
https://patchwork.kernel.org/project/qemu-devel/patch/20250717034054.1903991-3-jamin_lin@aspeedtech.com/#26540626

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250925050535.2657256-6-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>