also carefully booleanize the false value

include/features.h

@@ -421,8 +421,8 @@ uClibc was built without large file support enabled.
 #if __GNUC__ == 2 && __GNUC_MINOR__ < 96
 #define __builtin_expect(x, expected_value) (x)
 #endif
-#define likely(x)      __builtin_expect((!!(x)),1)
-#define unlikely(x)    __builtin_expect((x),0)
+#define likely(x)	__builtin_expect((!!(x)),1)
+#define unlikely(x)	__builtin_expect((!!(x)),0)
 
 /* --- this is added to integrate linuxthreads */
 #define __USE_UNIX98            1