Fixed error due to implicit conversion from unsigned 'int' to 'char'.

The nopoll API expect 'char'. It does not seem to matter what values are passed for the testing as these values are random and not being checked anywhere for verification.

Author: Ramki Ananthakrishnan

test/nopoll-regression-client.c

@@ -1678,8 +1678,8 @@ nopoll_bool test_17_send_and_receive_test (noPollCtx * ctx, noPollConn * conn, n
 
 	/* printf ("Test 17: sending partial content..\n"); */
 	_socket = nopoll_conn_socket (conn);
-	buffer[0] = 129;
-	buffer[1] = 150;
+	buffer[0] = 126;
+	buffer[1] = 127;
 	send (_socket, buffer, 2, 0);
 
 	if (read_after_header) {