11204 smatch issue in zlib/deflate.c

*** 186,197 ****
  /* ===========================================================================
   * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
   * prev[] will be initialized on the fly.
   */
  #define CLEAR_HASH(s) \
      s->head[s->hash_size-1] = NIL; \
!     zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
  
  /* ===========================================================================
   * Slide the hash table when sliding the window down (could be avoided with 32
   * bit values at the expense of memory usage). We slide even when level == 0 to
   * keep the hash table consistent if we switch back to level > 0 later.
--- 186,200 ----
  /* ===========================================================================
   * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
   * prev[] will be initialized on the fly.
   */
  #define CLEAR_HASH(s) \
+     do { \
          s->head[s->hash_size-1] = NIL; \
!         zmemzero((Bytef *)s->head, \
!         (unsigned)(s->hash_size-1)*sizeof(*s->head)); \
!     } while (0)
  
  /* ===========================================================================
   * Slide the hash table when sliding the window down (could be avoided with 32
   * bit values at the expense of memory usage). We slide even when level == 0 to
   * keep the hash table consistent if we switch back to level > 0 later.