Fix delimiter option

Add the newline (\n) at the end of --delimiter option. Thus, the usage
menu is shown with all options at their own lines.
Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>

src/samples/stdinpub.c

@@ -63,7 +63,7 @@ void usage()
 	printf("  --port <port> (default is 1883)\n");
 	printf("  --qos <qos> (default is 0)\n");
 	printf("  --retained (default is off)\n");
-	printf("  --delimiter <delim> (default is \\n)");
+	printf("  --delimiter <delim> (default is \\n)\n");
 	printf("  --clientid <clientid> (default is hostname+timestamp)");
 	printf("  --maxdatalen 100\n");
 	printf("  --username none\n");

src/samples/stdinpuba.c

@@ -62,7 +62,7 @@ void usage()
 	printf("  --port <port> (default is 1883)\n");
 	printf("  --qos <qos> (default is 0)\n");
 	printf("  --retained (default is off)\n");
-	printf("  --delimiter <delim> (default is \\n)");
+	printf("  --delimiter <delim> (default is \\n)\n");
 	printf("  --clientid <clientid> (default is hostname+timestamp)");
 	printf("  --maxdatalen 100\n");
 	printf("  --username none\n");