staging: wlags49_h2: remove DBG_DEFN()

It didn't do anything, and no one called it, so remove it.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlags49_h2/debug.h

@@ -180,7 +180,6 @@ typedef struct {
 #else /* DBG */
 /****************************************************************************/
 
-#define DBG_DEFN
 #define DBG_PRINT(S...)
 #define DBG_PARAM(A, N, F, S...)
 #define DBG_ERROR(A, S...)