scsi: qla2xxx: Fix nvme_fc_rcv_ls_req() undefined error

The kernel robot reported below build error,

>> ERROR: modpost: "nvme_fc_rcv_ls_req" [drivers/scsi/qla2xxx/qla2xxx.ko] undefined!

Use CONFIG_NVME_FC enabled check to fix the build error.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308021445.txlNq7UC-lkp@intel.com/Signed-off-by: Nilesh Javali <njavali@marvell.com>
Link: https://lore.kernel.org/r/20230824151521.35261-1-njavali@marvell.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_nvme.c

@@ -1182,10 +1182,12 @@ qla2xxx_process_purls_pkt(struct scsi_qla_host *vha, struct purex_item *item)
 	struct qla_nvme_unsol_ctx *uctx = item->purls_context;
 	fc_port_t *fcport = uctx->fcport;
 	struct qla_nvme_lsrjt_pt_arg a;
-	int ret;
+	int ret = 1;
 
+#if (IS_ENABLED(CONFIG_NVME_FC))
 	ret = nvme_fc_rcv_ls_req(fcport->nvme_remote_port, &uctx->lsrsp,
 				 &item->iocb, item->size);
+#endif
 	if (ret) {
 		ql_dbg(ql_dbg_unsol, vha, 0x2125, "NVMe tranport ls_req failed\n");
 		memset((void *)&a, 0, sizeof(a));