fix fuzzing so terminology works at all again

if (len <= 0)

in _cb_fd_read() is ALWAYS coming up with len < 0 for me and that'd
be LOGICAL... eg if read() returns an error (something ok to allow us
to continue) and so my terminal content NEVER appears - because
terminology is returning false from the fb handler asking it to be
deleted. this is wrong so put it inside #ifdef of fuzzing so it
doesn't affect "normal people". i still think it is broken tho... but
at least i have my terminal back now.

src/bin/termpty.c

@@ -276,9 +276,9 @@ _cb_fd_read(void *data, Ecore_Fd_Handler *fd_handler)
         termpty_handle_buf(ty, codepoint, j);
      }
    if (ty->cb.change.func) ty->cb.change.func(ty->cb.change.data);
+#ifdef ENABLE_FUZZING
    if (len <= 0)
      {
-#ifdef ENABLE_FUZZING
         ty->exit_code = 0;
         ty->pid = -1;
 
@@ -290,9 +290,9 @@ _cb_fd_read(void *data, Ecore_Fd_Handler *fd_handler)
         ty->slavefd = -1;
         if (ty->cb.exited.func)
           ty->cb.exited.func(ty->cb.exited.data);
-#endif
         return ECORE_CALLBACK_CANCEL;
      }
+#endif
 
    return EINA_TRUE;
 }