compat-drivers: fix removal of tmp pending-stable files

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
diff --git a/scripts/admin-update.sh b/scripts/admin-update.sh
index bae4143..e072b12 100755
--- a/scripts/admin-update.sh
+++ b/scripts/admin-update.sh
@@ -917,7 +917,7 @@
 		get_stable_patches drm
 	fi
 
-	rm -f .network_stable .drm_stable
+	rm -f ${STABLE_PREFIX}network ${STABLE_PREFIX}drm
 	cd $LAST_DIR
 
 fi