Don't shadow parameters with local variables

This is a little error-prone when the local has a different type
from the parameter, and is very error-prone with both have the same
type.  Let's not do this.

Fixes CID #437,438,439,440,441.

src/or/directory.c

@@ -2592,7 +2592,7 @@ client_likes_consensus(networkstatus_t *v, const char *want_url)
  * Always return 0. */
 static int
 directory_handle_command_get(dir_connection_t *conn, const char *headers,
-                             const char *body, size_t body_len)
+                             const char *req_body, size_t req_body_len)
 {
   size_t dlen;
   char *url, *url_mem, *header;
@@ -2602,8 +2602,8 @@ directory_handle_command_get(dir_connection_t *conn, const char *headers,
   size_t url_len;
 
   /* We ignore the body of a GET request. */
-  (void)body;
-  (void)body_len;
+  (void)req_body;
+  (void)req_body_len;
 
   log_debug(LD_DIRSERV,"Received GET command.");
 

src/or/eventdns.c

@@ -1831,8 +1831,8 @@ evdns_server_request_respond(struct evdns_server_request *_req, int err)
 	r = sendto(port->socket, req->response, req->response_len, 0,
 			   (struct sockaddr*) &req->addr, req->addrlen);
 	if (r<0) {
-		int err = last_error(port->socket);
-		if (! error_is_eagain(err))
+		int error = last_error(port->socket);
+		if (! error_is_eagain(error))
 			return -1;
 
 		if (port->pending_replies) {

src/or/policies.c

@@ -83,15 +83,15 @@ policy_expand_private(smartlist_t **policy)
        continue;
      }
      for (i = 0; private_nets[i]; ++i) {
-       addr_policy_t policy;
-       memcpy(&policy, p, sizeof(addr_policy_t));
-       policy.is_private = 0;
-       policy.is_canonical = 0;
-       if (tor_addr_parse_mask_ports(private_nets[i], &policy.addr,
-                                  &policy.maskbits, &port_min, &port_max)<0) {
+       addr_policy_t newpolicy;
+       memcpy(&newpolicy, p, sizeof(addr_policy_t));
+       newpolicy.is_private = 0;
+       newpolicy.is_canonical = 0;
+       if (tor_addr_parse_mask_ports(private_nets[i], &newpolicy.addr,
+                               &newpolicy.maskbits, &port_min, &port_max)<0) {
          tor_assert(0);
        }
-       smartlist_add(tmp, addr_policy_get_canonical_entry(&policy));
+       smartlist_add(tmp, addr_policy_get_canonical_entry(&newpolicy));
      }
      addr_policy_free(p);
   });

src/or/relay.c

@@ -2337,13 +2337,13 @@ connection_or_flush_from_first_active_circuit(or_connection_t *conn, int max,
 
     /* Calculate the exact time that this cell has spent in the queue. */
     if (get_options()->CellStatistics && !CIRCUIT_IS_ORIGIN(circ)) {
-      struct timeval now;
+      struct timeval tvnow;
       uint32_t flushed;
       uint32_t cell_waiting_time;
       insertion_time_queue_t *it_queue = queue->insertion_times;
-      tor_gettimeofday_cached(&now);
-      flushed = (uint32_t)((now.tv_sec % SECONDS_IN_A_DAY) * 100L +
-                 (uint32_t)now.tv_usec / (uint32_t)10000L);
+      tor_gettimeofday_cached(&tvnow);
+      flushed = (uint32_t)((tvnow.tv_sec % SECONDS_IN_A_DAY) * 100L +
+                 (uint32_t)tvnow.tv_usec / (uint32_t)10000L);
       if (!it_queue || !it_queue->first) {
         log_info(LD_GENERAL, "Cannot determine insertion time of cell. "
                              "Looks like the CellStatistics option was "

src/or/routerparse.c

@@ -3512,10 +3512,10 @@ networkstatus_parse_detached_signatures(const char *s, const char *eos)
 
     siglist = detached_get_signatures(sigs, flavor);
     is_duplicate = 0;
-    SMARTLIST_FOREACH(siglist, document_signature_t *, s, {
-      if (s->alg == alg &&
-          tor_memeq(id_digest, s->identity_digest, DIGEST_LEN) &&
-          tor_memeq(sk_digest, s->signing_key_digest, DIGEST_LEN)) {
+    SMARTLIST_FOREACH(siglist, document_signature_t *, dsig, {
+      if (dsig->alg == alg &&
+          tor_memeq(id_digest, dsig->identity_digest, DIGEST_LEN) &&
+          tor_memeq(sk_digest, dsig->signing_key_digest, DIGEST_LEN)) {
         is_duplicate = 1;
       }
     });