system: Use &error_abort in memory_region_init_ram_[device_]ptr()

system: Use &error_abort in memory_region_init_ram_[device_]ptr()

If an unexpected error condition happens, we have to abort
(&fatal_error is meant for expected errors).

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20231120133112.82447-1-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>