ikalogic-scanalogic2: Let the sdi getter popuplage sdi->connection_id

This fixes bug #440.
diff --git a/src/hardware/ikalogic-scanalogic2/api.c b/src/hardware/ikalogic-scanalogic2/api.c
index e9b7327..89d12ea 100644
--- a/src/hardware/ikalogic-scanalogic2/api.c
+++ b/src/hardware/ikalogic-scanalogic2/api.c
@@ -71,7 +71,6 @@
 	struct device_info dev_info;
 	int ret, i;
 	char *fw_ver_str;
-	char connection_id[64];
 
 	(void)options;
 
@@ -137,15 +136,11 @@
 			continue;
 		}
 
-		usb_get_port_path(libusb_get_device(usb->devhdl),
-				connection_id, sizeof(connection_id));
-
 		sdi->priv = devc;
 		sdi->driver = di;
 		sdi->inst_type = SR_INST_USB;
 		sdi->conn = usb;
 		sdi->serial_num = g_strdup_printf("%d", dev_info.serial);
-		sdi->connection_id = g_strdup(connection_id);
 
 		for (i = 0; channel_names[i]; i++) {
 			ch = sr_channel_new(i, SR_CHANNEL_LOGIC, TRUE,