title: "useless type qualifier" error
body: <p>I get the following error with the following code. I tried to figure out where the problem is over Google, but I didn't find anything helpful.</p>
  
  <pre><code>Compiling /home/tectu/projects/resources/chibios/ext/lcd/touchpad.c
  In file included from /home/tectu/projects/resources/chibios/ext/lcd/touchpad.c:1:0:
  /home/tectu/projects/resources/chibios/ext/lcd/touchpad.h:17:1: warning: useless type qualifier in empty declaration [enabled by default]
  </code></pre>
  
  <p>Here's the the code from line 12 to line 17 from <code>touchpad.h</code>:</p>
  
  <pre><code>volatile struct cal {
      float xm; 
      float ym; 
      float xn; 
      float yn; 
  };
  </code></pre>
  
  <p>And here's how I use this struct inside <code>touchpad.c</code>:</p>
  
  <pre><code>static struct cal cal = { 
      1, 1, 0, 0  
  };
  </code></pre>
  
  <p>Can anyone show me the light? :D</p>