scsi: qla2xxx: Fix a NULL pointer dereference in an error path

This patch fixes the following Coverity complaint:

FORWARD_NULL

qla_init.c: 5275 in qla2x00_configure_local_loop()
5269
5270     		if (fcport->scan_state == QLA_FCPORT_FOUND)
5271     			qla24xx_fcport_handle_login(vha, fcport);
5272     	}
5273
5274     cleanup_allocation:
>>>     CID 353340:    (FORWARD_NULL)
>>>     Passing null pointer "new_fcport" to "qla2x00_free_fcport", which dereferences it.
5275     	qla2x00_free_fcport(new_fcport);
5276
5277     	if (rval != QLA_SUCCESS) {
5278     		ql_dbg(ql_dbg_disc, vha, 0x2098,
5279     		    "Configure local loop error exit: rval=%x.\n", rval);
5280     	}
qla_init.c: 5275 in qla2x00_configure_local_loop()
5269
5270     		if (fcport->scan_state == QLA_FCPORT_FOUND)
5271     			qla24xx_fcport_handle_login(vha, fcport);
5272     	}
5273
5274     cleanup_allocation:
>>>     CID 353340:    (FORWARD_NULL)
>>>     Passing null pointer "new_fcport" to "qla2x00_free_fcport", which dereferences it.
5275     	qla2x00_free_fcport(new_fcport);
5276
5277     	if (rval != QLA_SUCCESS) {
5278     		ql_dbg(ql_dbg_disc, vha, 0x2098,
5279     		    "Configure local loop error exit: rval=%x.\n", rval);
5280     	}

Fixes: 3dae220595 ("scsi: qla2xxx: Use common routine to free fcport struct")
Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Quinn Tran <qutran@marvell.com>
Cc: Martin Wilck <mwilck@suse.com>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: Roman Bolshakov <r.bolshakov@yadro.com>
Link: https://lore.kernel.org/r/20200118042056.32232-1-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_init.c

@@ -5108,7 +5108,7 @@ skip_login:
 	rval = qla2x00_get_id_list(vha, ha->gid_list, ha->gid_list_dma,
 	    &entries);
 	if (rval != QLA_SUCCESS)
-		goto cleanup_allocation;
+		goto err;
 
 	ql_dbg(ql_dbg_disc, vha, 0x2011,
 	    "Entries in ID list (%d).\n", entries);
@@ -5138,7 +5138,7 @@ skip_login:
 		ql_log(ql_log_warn, vha, 0x2012,
 		    "Memory allocation failed for fcport.\n");
 		rval = QLA_MEMORY_ALLOC_FAILED;
-		goto cleanup_allocation;
+		goto err;
 	}
 	new_fcport->flags &= ~FCF_FABRIC_DEVICE;
 
@@ -5228,7 +5228,7 @@ skip_login:
 				ql_log(ql_log_warn, vha, 0xd031,
 				    "Failed to allocate memory for fcport.\n");
 				rval = QLA_MEMORY_ALLOC_FAILED;
-				goto cleanup_allocation;
+				goto err;
 			}
 			spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
 			new_fcport->flags &= ~FCF_FABRIC_DEVICE;
@@ -5271,15 +5271,14 @@ skip_login:
 			qla24xx_fcport_handle_login(vha, fcport);
 	}
 
-cleanup_allocation:
 	qla2x00_free_fcport(new_fcport);
 
-	if (rval != QLA_SUCCESS) {
-		ql_dbg(ql_dbg_disc, vha, 0x2098,
-		    "Configure local loop error exit: rval=%x.\n", rval);
-	}
+	return rval;
 
-	return (rval);
+err:
+	ql_dbg(ql_dbg_disc, vha, 0x2098,
+	       "Configure local loop error exit: rval=%x.\n", rval);
+	return rval;
 }
 
 static void