libsepol/cil: drop dead store

../cil/src/cil_binary.c:2230:24: warning: Value stored to 'cb_node' during its initialization is never read [deadcode.DeadStores]
        struct cil_tree_node *cb_node = node->cl_head;
                              ^~~~~~~   ~~~~~~~~~~~~~

Found by clang-analyzer

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

libsepol/cil/src/cil_binary.c

@@ -2227,7 +2227,7 @@ int cil_booleanif_to_policydb(policydb_t *pdb, const struct cil_db *db, struct c
 	int rc = SEPOL_ERR;
 	struct cil_args_booleanif bool_args;
 	struct cil_booleanif *cil_boolif = (struct cil_booleanif*)node->data;
-	struct cil_tree_node *cb_node = node->cl_head;
+	struct cil_tree_node *cb_node;
 	struct cil_tree_node *true_node = NULL;
 	struct cil_tree_node *false_node = NULL;
 	struct cil_tree_node *tmp_node = NULL;