Fix compilation of several example programs.

* examples/header.c: Use streamrefs.
* examples/mimetest.c: Likewise.
* examples/mta.c: Likewise.
* examples/nntpclient.c: Remove an unused variable.

@@ -173,7 +173,7 @@ cmd_dump (int argc, char **argv)
   if (argc == 2)
     off = strtoul (argv[1], NULL, 0);
 
-  status = mu_header_get_stream (header, &stream);
+  status = mu_header_get_streamref (header, &stream);
   if (status)
     {
       mu_error ("%u: cannot get stream: %s", line_num, mu_strerror (status));
@@ -183,6 +183,7 @@ cmd_dump (int argc, char **argv)
   status = mu_stream_seek (stream, off, SEEK_SET, NULL);
   if (status)
     {
+      mu_stream_destroy (&stream);
       mu_error ("%u: cannot seek: %s", line_num, mu_strerror (status));
       return;
     }
@@ -192,6 +193,7 @@ cmd_dump (int argc, char **argv)
     {
       fwrite (buf, 1, n, stdout);
     }
+  mu_stream_destroy (&stream);
 }  
 
 void
@@ -272,7 +274,7 @@ cmd_write (int argc, char **argv)
   if (check_args (argv[0], argc, 1, 1))
     return;
 
-  status = mu_header_get_stream (header, &str);
+  status = mu_header_get_streamref (header, &str);
   if (status)
     {
       mu_error ("%u: cannot get stream: %s", line_num, mu_strerror (status));
@@ -286,6 +288,7 @@ cmd_write (int argc, char **argv)
       if (buf[0] == '\n')
 	break;
     }
+  mu_stream_destroy (&str);
 }
 
 void

@@ -249,12 +249,12 @@ message_display_parts (mu_message_t msg, int indent)
 	  printf ("%*.*sText Message\n", indent, indent, "");
           printf ("%*.*sBegin\n", indent, indent, "");
           mu_message_get_body (part, &body);
-          mu_body_get_stream (body, &str);
+          mu_body_get_streamref (body, &str);
           /* Make sure the original body stream is not closed when
              str gets destroyed */
           mu_filter_create (&str, str, encoding, MU_FILTER_DECODE,
 			    MU_STREAM_READ | MU_STREAM_NO_CLOSE);
-
+	  
 	  while (mu_stream_readline (str, buf, sizeof (buf), &nbytes) == 0
 		 && nbytes)
             {

@@ -19,7 +19,7 @@
 
 /* This is a "fake" mta designed for testing purposes. It imitates
    sendmail sending and daemon modes. It does not actually send anything,
-   instead it just outputs the transcript of what would have been done.
+   instead it just outputs a transcript of what would have been done.
 
    Invocation:
    
@@ -326,7 +326,7 @@ mta_send (mu_message_t msg)
   fprintf (diag, "ENVELOPE TO: %s\n", value);
   free (value);
 
-  mu_message_get_stream (msg, &stream);
+  mu_message_get_streamref (msg, &stream);
   line = 0;
   fprintf (diag, "%4lu: ", (unsigned long) line);
   while (mu_stream_read (stream, buffer, sizeof buffer - 1, &n) == 0
@@ -344,6 +344,7 @@ mta_send (mu_message_t msg)
 	    }
 	}
     }
+  mu_stream_destroy (&stream);
   fprintf (diag, "\nEND OF MESSAGE\n");
   fflush (diag);
   return 0;

@@ -423,7 +423,6 @@ com_body (char *arg)
 
    if (status == 0 && stream != NULL)
     {
-      size_t n = 0;
       char buf[128];
       while (mu_stream_readline (stream, buf, sizeof buf, 0) == 0)
         printf ("%s", buf);