Use LPM4_EXIT to return from sleep on msp430.

cpu/msp430/button.c

@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
  * SUCH DAMAGE. 
  *
- * @(#)$Id: button.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
+ * @(#)$Id: button.c,v 1.2 2006/08/17 15:41:13 bg- Exp $
  */
 
 #include <io.h>
@@ -34,8 +34,6 @@
 
 #include "contiki.h"
 
-#include "dev/lpm.h"
-
 #include "dev/button.h"
 
 #define BUTTON_PORT 2
@@ -75,6 +73,6 @@ __button_interrupt(void)
     if(selecting_proc != NULL) {
       process_post(selecting_proc, PROCESS_EVENT_MSG, &button_msg);
     }
-    LPM_AWAKE();
+    LPM4_EXIT;
   }
 }