scsi: iscsi: Remove unused extern declaration iscsi_lookup_iface()

This is not used anymore and can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20230725141531.10424-1-yuehaibing@huawei.comReviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/scsi/scsi_transport_iscsi.h

@@ -472,7 +472,6 @@ extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
 					      uint32_t iface_type,
 					      uint32_t iface_num, int dd_size);
 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
-extern struct iscsi_iface *iscsi_lookup_iface(int handle);
 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
 extern int iscsi_is_session_dev(const struct device *dev);