add unit test for link to same entity

unit-tests.sh

@@ -438,8 +438,24 @@ function test15 {
 
 }
 
+function test16 {
+	reinstall_vimc
+		modprobe -r vimc
+		modprobe -v vimc sca_mult=1
+		echo "============================================="
+		echo "make sure it is impossible to create a link from an entity to itself"
+		echo "============================================="
+
+		DEV=mdev
+		mkdir "/configfs/vimc/mdev/" || exit 1
+		mkdir "/configfs/vimc/mdev/vimc-scaler:sca1" || exit 1
+		link sca1 vimc-scaler 1 sca1 vimc-scaler 0 on && echo "Failure: connecting a scaler to itself should not be allowed" && exit 1
+
+}
+
+
 if [ $# == 0 ]; then
-	for test_idx in {1..9}
+	for test_idx in {1..16}
 	do
 
 		test$test_idx