scsi: virtio-scsi: Eliminate anonymous module_init & module_exit

Eliminate anonymous module_init() and module_exit(), which can lead to
confusion or ambiguity when reading System.map, crashes/oops/bugs, or an
initcall_debug log.

Give each of these init and exit functions unique driver-specific names to
eliminate the anonymous names.

Example 1: (System.map)
 ffffffff832fc78c t init
 ffffffff832fc79e t init
 ffffffff832fc8f8 t init

Example 2: (initcall_debug log)
 calling  init+0x0/0x12 @ 1
 initcall init+0x0/0x12 returned 0 after 15 usecs
 calling  init+0x0/0x60 @ 1
 initcall init+0x0/0x60 returned 0 after 2 usecs
 calling  init+0x0/0x9a @ 1
 initcall init+0x0/0x9a returned 0 after 74 usecs

Link: https://lore.kernel.org/r/20220316192010.19001-6-rdunlap@infradead.org
Fixes: 4fe74b1c ("[SCSI] virtio-scsi: SCSI driver for QEMU based virtual machines")
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/virtio_scsi.c

@@ -988,7 +988,7 @@ static struct virtio_driver virtio_scsi_driver = {
 	.remove = virtscsi_remove,
 };
 
-static int __init init(void)
+static int __init virtio_scsi_init(void)
 {
 	int ret = -ENOMEM;
 
@@ -1020,14 +1020,14 @@ static int __init init(void)
 	return ret;
 }
 
-static void __exit fini(void)
+static void __exit virtio_scsi_fini(void)
 {
 	unregister_virtio_driver(&virtio_scsi_driver);
 	mempool_destroy(virtscsi_cmd_pool);
 	kmem_cache_destroy(virtscsi_cmd_cache);
 }
-module_init(init);
-module_exit(fini);
+module_init(virtio_scsi_init);
+module_exit(virtio_scsi_fini);
 
 MODULE_DEVICE_TABLE(virtio, id_table);
 MODULE_DESCRIPTION("Virtio SCSI HBA driver");