libsepol: remove dead stores

conditional.c:391:4: warning: Value stored to 'i' is never read [deadcode.DeadStores]
                        i = 0;
                        ^   ~
conditional.c:718:2: warning: Value stored to 'len' is never read [deadcode.DeadStores]
        len = 0;
        ^     ~
conditional.c:772:2: warning: Value stored to 'len' is never read [deadcode.DeadStores]
        len = 0;
        ^     ~

services.c:89:10: warning: Value stored to 'new_stack' during its initialization is never read [deadcode.DeadStores]
                char **new_stack = stack;
                       ^~~~~~~~~   ~~~~~

services.c:440:11: warning: Value stored to 'new_expr_list' during its initialization is never read [deadcode.DeadStores]
                        char **new_expr_list = expr_list;
                               ^~~~~~~~~~~~~   ~~~~~~~~~

../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/src/conditional.c

@@ -388,7 +388,6 @@ int cond_normalize_expr(policydb_t * p, cond_node_t * cn)
 	for (e = cn->expr; e != NULL; e = e->next) {
 		switch (e->expr_type) {
 		case COND_BOOL:
-			i = 0;
 			/* see if we've already seen this bool */
 			if (!bool_present(e->bool, cn->bool_ids, cn->nbools)) {
 				/* count em all but only record up to COND_MAX_BOOLS */
@@ -715,7 +714,6 @@ static int cond_read_av_list(policydb_t * p, void *fp,
 
 	*ret_list = NULL;
 
-	len = 0;
 	rc = next_entry(buf, fp, sizeof(uint32_t));
 	if (rc < 0)
 		return -1;
@@ -769,7 +767,6 @@ static int cond_read_node(policydb_t * p, cond_node_t * node, void *fp)
 
 	node->cur_state = le32_to_cpu(buf[0]);
 
-	len = 0;
 	rc = next_entry(buf, fp, sizeof(uint32_t));
 	if (rc < 0)
 		goto err;

libsepol/src/services.c

@@ -86,7 +86,7 @@ static int next_stack_entry;
 static void push(char *expr_ptr)
 {
 	if (next_stack_entry >= stack_len) {
-		char **new_stack = stack;
+		char **new_stack;
 		int new_stack_len;
 
 		if (stack_len == 0)
@@ -441,7 +441,7 @@ static int constraint_expr_eval_reason(context_struct_t *scontext,
 	for (e = constraint->expr; e; e = e->next) {
 		/* Allocate a stack to hold expression buffer entries */
 		if (expr_counter >= expr_list_len) {
-			char **new_expr_list = expr_list;
+			char **new_expr_list;
 			int new_expr_list_len;
 
 			if (expr_list_len == 0)