zd1211rw: add unlikely to ZD_ASSERT

Case assert is violated should be quite unlikely.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_def.h

@@ -45,7 +45,7 @@ typedef u16 __nocast zd_addr_t;
 #ifdef DEBUG
 #  define ZD_ASSERT(x) \
 do { \
-	if (!(x)) { \
+	if (unlikely(!(x))) { \
 		pr_debug("%s:%d ASSERT %s VIOLATED!\n", \
 			__FILE__, __LINE__, __stringify(x)); \
 		dump_stack(); \