sle15: Before loading the newly built modules make sure nothing is loaded

The module build process may load modules which are installed on
the container host itself.
Make sure these are unloaded before loading our brand new modules.

Signed-off-by: Egbert Eich <eich@suse.com>

Author: e4t

sle15/nvidia-driver

@@ -520,6 +520,9 @@ _build() {
 
 _load() {
     _mount_rootfs
+    # Something in the build process may have decided to load drivers that happened to be installed.
+    # Make sure they are uninstalled.
+    lsmod | grep -q nvidia && { _unload_driver || exit 1; } || true
     _load_driver || exit 1
     _write_kernel_update_hook