examples: Fix network echo receive terminators

examples/netloop/lo_listener.c

@@ -64,7 +64,7 @@ struct net_listener_s
   struct sockaddr_in addr;
   fd_set          master;
   fd_set          working;
-  char            buffer[IOBUFFER_SIZE];
+  char            buffer[IOBUFFER_SIZE + 1];
   int             listensd;
   int             mxsd;
 };

examples/netloop/lo_main.c

@@ -63,7 +63,7 @@ static int lo_client(void)
 {
   struct sockaddr_in myaddr;
   char outbuf[IOBUFFER_SIZE];
-  char inbuf[IOBUFFER_SIZE];
+  char inbuf[IOBUFFER_SIZE + 1];
   int sockfd;
   int len;
   int nbytessent;

examples/poll/host.c

@@ -64,7 +64,7 @@ int main(int argc, char **argv, char **envp)
 {
   struct sockaddr_in myaddr;
   char outbuf[IOBUFFER_SIZE];
-  char inbuf[IOBUFFER_SIZE];
+  char inbuf[IOBUFFER_SIZE + 1];
   int sockfd;
   int len;
   int nbytessent;

examples/poll/net_listener.c

@@ -64,7 +64,7 @@ struct net_listener_s
   struct sockaddr_in addr;
   fd_set          master;
   fd_set          working;
-  char            buffer[IOBUFFER_SIZE];
+  char            buffer[IOBUFFER_SIZE + 1];
   int             listensd;
   int             mxsd;
 };

examples/poll/net_reader.c

@@ -121,7 +121,7 @@ static void net_configure(void)
 static void net_receive(int sd)
 {
   struct timeval timeout;
-  char buffer[IOBUFFER_SIZE];
+  char buffer[IOBUFFER_SIZE + 1];
   char *ptr;
   fd_set readset;
   int nbytes;