[PATCH] zlib merge: return code

Don't think anyone actually bothers to check specific error codes, but
it shouldn't hurt either.

lib/zlib_inflate/inftrees.c

@@ -229,7 +229,7 @@ static int huft_build(
 
         /* allocate new table */
         if (*hn + z > MANY)     /* (note: doesn't matter for fixed) */
-          return Z_MEM_ERROR;   /* not enough memory */
+          return Z_DATA_ERROR;  /* overflow of MANY */
         u[h] = q = hp + *hn;
         *hn += z;