several typos fixed, optimize MSETNX to avoid unnecessary loop

src/intset.c

@@ -123,7 +123,7 @@ static uint8_t intsetSearch(intset *is, int64_t value, uint32_t *pos) {
     } else {
         /* Check for the case where we know we cannot find the value,
          * but do know the insert position. */
-        if (value > _intsetGet(is,intrev32ifbe(is->length)-1)) {
+        if (value > _intsetGet(is,max)) {
             if (pos) *pos = intrev32ifbe(is->length);
             return 0;
         } else if (value < _intsetGet(is,0)) {