LibLine: Never assume a 25x80 terminal

Just reuse the lldb hack if the normal stderr ioctl fails for any
reason, and read the size directly off /dev/tty.

Userland/Libraries/LibLine/Editor.cpp

@@ -218,22 +218,17 @@ void Editor::ensure_free_lines_from_origin(size_t count)
 void Editor::get_terminal_size()
 {
  struct winsize ws;
-
- if (ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) < 0) {
- m_num_columns = 80;
- m_num_lines = 25;
- } else {
- if (ws.ws_col == 0 || ws.ws_row == 0) {
- // LLDB uses ttys which "work" and then gives us a zero sized
- // terminal which is far from useful
- if (int fd = open("/dev/tty", O_RDONLY); fd != -1) {
- ioctl(fd, TIOCGWINSZ, &ws);
- close(fd);
- }
+ ioctl(STDERR_FILENO, TIOCGWINSZ, &ws);
+ if (ws.ws_col == 0 || ws.ws_row == 0) {
+ // LLDB uses ttys which "work" and then gives us a zero sized
+ // terminal which is far from useful
+ if (int fd = open("/dev/tty", O_RDONLY); fd != -1) {
+ ioctl(fd, TIOCGWINSZ, &ws);
+ close(fd);
  }
- m_num_columns = ws.ws_col;
- m_num_lines = ws.ws_row;
  }
+ m_num_columns = ws.ws_col;
+ m_num_lines = ws.ws_row;
 }
 
 void Editor::add_to_history(String const& line)