Add macro M_HASH_FINAL

m-core.h

@@ -668,7 +668,8 @@
 #endif
 
 #define M_HASH_DECL(hash)   size_t hash = M_HASH_INIT ^ M_HASH_SEED
-#define M_HASH_UP(hash,h)   hash = M_HASH_CALC(hash, (h))
+#define M_HASH_UP(hash,h)   do { hash = M_HASH_CALC(hash, (h)); } while (0)
+#define M_HASH_FINAL(hash)  (hash)
 
 /* Safe, efficient, and portable Rotate:
    It should be recognized by any compiler and generate a single roll instruction */