hostip: fix unintended destruction of hash table

.. and added unit1602 for hash.c

tests/data/Makefile.inc

@@ -155,7 +155,7 @@ test1520 \
 \
 test1525 test1526 test1527 test1528 test1529 \
 \
-test1600 test1601 \
+test1600 test1601 test1602 \
 \
 test1800 test1801 \
 \

tests/data/test1602

@@ -0,0 +1,26 @@
+<testcase>
+<info>
+<keywords>
+unittest
+hash
+</keywords>
+</info>
+
+#
+# Client-side
+<client>
+<server>
+none
+</server>
+<features>
+unittest
+</features>
+ <name>
+Internal hash create/add/destroy testing, exercising clean functions
+ </name>
+<tool>
+unit1602
+</tool>
+</client>
+
+</testcase>