target: Fix user data segment multiplier in spc_emulate_evpd_b3()

This patch fixes an apparent cut and paste error in spc_emulate_evpd_b3(),
where lba_map_segment_size was being used twice for the Referrals VPD.

Go ahead and set the correct user data segment multiplier instead of
user data segment size.
Signed-off-by: Sebastian Herbszt <herbszt@gmx.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_spc.c

@@ -664,7 +664,7 @@ spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
 	buf[0] = dev->transport->get_device_type(dev);
 	buf[3] = 0x0c;
 	put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
-	put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[12]);
+	put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
 
 	return 0;
 }