Noticed by sparse. ("Using plain integer as NULL pointer")

Signed-off-by: Ramsay Jones <ram...@ramsay1.demon.co.uk>
---
 khash.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/khash.h b/khash.h
index 0fdf39d..c4c1613 100644
--- a/khash.h
+++ b/khash.h
@@ -114,7 +114,7 @@ static const double __ac_HASH_UPPER = 0.77;
        }                                                                       
                                                                \
        SCOPE int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \
        { /* This function uses 0.25*n_buckets bytes of working space instead 
of [sizeof(key_t+val_t)+.25]*n_buckets. */ \
-               khint32_t *new_flags = 0;                                       
                                        \
+               khint32_t *new_flags = NULL;                                    
                                        \
                khint_t j = 1;                                                  
                                                \
                {                                                               
                                                                \
                        kroundup32(new_n_buckets);                              
                                        \
-- 
1.8.4
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