fixed a fault in pty.c

hio/bin/t06.c

@@ -1,5 +1,6 @@
 #include <hio-sck.h>
 #include <hio-http.h>
+#include <hio-dhcp.h>
 #include <hio-utl.h>
 #include <stdio.h>
 #include <string.h>

hio/lib/pty.c

@@ -147,7 +147,7 @@ static pid_t standard_fork_and_exec (hio_dev_pty_t* dev, int pfds[], hio_dev_pty
 		if (dup2(pfds[1], 0) == -1 || dup2(pfds[1], 1) == -1 || dup2(pfds[1], 2) == -1) goto slave_oops;
 
 		close (pfds[1]);
-		pfds[1] == HIO_SYSHND_INVALID;
+		pfds[1] = HIO_SYSHND_INVALID;
 
 /* TODO: pass environment like TERM */
 		execv (param->argv[0], param->argv);