Coverity started complaining about this after
cc5ef90ed.
The code's not really different from before, but might
as well clarify its intent.
static void hdefault(HTAB *hashp);
static int choose_nelem_alloc(Size entrysize);
static bool init_htab(HTAB *hashp, long nelem);
-static void hash_corrupted(HTAB *hashp);
+static void hash_corrupted(HTAB *hashp) pg_attribute_noreturn();
static uint32 hash_initial_lookup(HTAB *hashp, uint32 hashvalue,
HASHBUCKET **bucketptr);
static long next_pow2_long(long num);