assert() is supposed to have type void

include/assert.h

@@ -5,7 +5,7 @@
 #ifdef NDEBUG
 #define	assert(x) (void)0
 #else
-#define assert(x) ((x) || (__assert_fail(#x, __FILE__, __LINE__, __func__),0))
+#define assert(x) ((void)((x) || (__assert_fail(#x, __FILE__, __LINE__, __func__),0)))
 #endif
 
 #ifdef __cplusplus