hw/scsi: Rearrange meson.build

We will modify this file shortly. Re-arrange it slightly first,
declaring source sets first.

No logical change.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230524093744.88442-4-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

hw/scsi/meson.build

@@ -1,4 +1,7 @@
 scsi_ss = ss.source_set()
+specific_scsi_ss = ss.source_set()
+virtio_scsi_ss = ss.source_set()
+
 scsi_ss.add(files(
   'emulation.c',
   'scsi-bus.c',
@@ -11,18 +14,15 @@ scsi_ss.add(when: 'CONFIG_LSI_SCSI_PCI', if_true: files('lsi53c895a.c'))
 scsi_ss.add(when: 'CONFIG_MEGASAS_SCSI_PCI', if_true: files('megasas.c'))
 scsi_ss.add(when: 'CONFIG_MPTSAS_SCSI_PCI', if_true: files('mptsas.c', 'mptconfig.c', 'mptendian.c'))
 scsi_ss.add(when: 'CONFIG_VMW_PVSCSI_SCSI_PCI', if_true: files('vmw_pvscsi.c'))
-system_ss.add_all(when: 'CONFIG_SCSI', if_true: scsi_ss)
-
-specific_scsi_ss = ss.source_set()
 
-virtio_scsi_ss = ss.source_set()
 virtio_scsi_ss.add(files('virtio-scsi.c', 'virtio-scsi-dataplane.c'))
-
 virtio_scsi_ss.add(when: 'CONFIG_VHOST_SCSI_COMMON', if_true: files('vhost-scsi-common.c'))
 virtio_scsi_ss.add(when: 'CONFIG_VHOST_SCSI', if_true: files('vhost-scsi.c'))
 virtio_scsi_ss.add(when: 'CONFIG_VHOST_USER_SCSI', if_true: files('vhost-user-scsi.c'))
+
 specific_scsi_ss.add_all(when: 'CONFIG_VIRTIO_SCSI', if_true: virtio_scsi_ss)
 
 specific_scsi_ss.add(when: 'CONFIG_SPAPR_VSCSI', if_true: files('spapr_vscsi.c'))
 
+system_ss.add_all(when: 'CONFIG_SCSI', if_true: scsi_ss)
 specific_ss.add_all(when: 'CONFIG_SCSI', if_true: specific_scsi_ss)