s390/iucv: Unexport iucv_root

There is no user of iucv_root outside of the core IUCV code left.
Therefore remove the EXPORT_SYMBOL.
Acked-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://lore.kernel.org/r/20240506194454.1160315-7-hca@linux.ibm.comSigned-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

include/net/iucv/iucv.h

@@ -82,7 +82,6 @@ struct iucv_array {
 } __attribute__ ((aligned (8)));
 
 extern const struct bus_type iucv_bus;
-extern struct device *iucv_root;
 
 struct device_driver;
 

net/iucv/iucv.c

@@ -73,8 +73,7 @@ const struct bus_type iucv_bus = {
 };
 EXPORT_SYMBOL(iucv_bus);
 
-struct device *iucv_root;
-EXPORT_SYMBOL(iucv_root);
+static struct device *iucv_root;
 
 static void iucv_release_device(struct device *device)
 {