Fix minor uninitialised ram and leak issues

src/bitcoin.c

@@ -109,8 +109,7 @@ static bool gbt_merkle_bins(gbtbase_t *gbt, json_t *transaction_arr)
 			len += strlen(txn);
 		}
 
-		gbt->txn_data = ckalloc(len + 1);
+		gbt->txn_data = ckzalloc(len + 1);
-		gbt->txn_data[len] = '\0';
 
 		for (i = 0; i < gbt->transactions; i++) {
 			char binswap[32];

src/libckpool.c

@@ -375,6 +375,7 @@ int connect_socket(char *url, char *port)
 	memset(&hints, 0, sizeof(struct addrinfo));
 	hints.ai_family = AF_UNSPEC;
 	hints.ai_socktype = SOCK_STREAM;
+	memset(&servinfobase, 0, sizeof(struct addrinfo));
 	servinfo = &servinfobase;
 
 	if (getaddrinfo(url, port, &hints, &servinfo) != 0) {

src/stratifier.c

@@ -2035,6 +2035,7 @@ static void load_users(ckpool_t *ckp)
 
 		LOGDEBUG("Added user %s with %lu shares", instance->username, pplns_shares);
 	}
+	closedir(dp);
 }
 
 int stratifier(proc_instance_t *pi)