**Describe the bug**

-2147483648 is the minimum integer representable with Int32, but ``toInt32OrNull('-2147483648')`` returns ``NULL``. On the other hand ``toInt32('-2147483648')`` correctly returns ``-2147483648``.

**Does it reproduce on recent release?**

Yes. It happens on 21.7.5.29-stable

**How to reproduce**

```
SELECT
    toInt32('-2147483648'),
    toInt32OrNull('-2147483648')

Query id: 94f4e069-6c0e-44d9-8e94-7ee83b90a529

┌─toInt32('-2147483648')─┬─toInt32OrNull('-2147483648')─┐
│            -2147483648 │                         ᴺᵁᴸᴸ │
└────────────────────────┴──────────────────────────────┘
```

**Expected behavior**

``toInt32('-2147483648')`` and ``toInt32OrNull('-2147483648')`` should both return ``-2147483648``.

template <is_integer T>
inline void readTextWithSizeSuffix(T & x, ReadBuffer & buf)
{
    readIntText(x, buf);
    if (buf.eof())
        return;
    
    auto finish = [&buf, &x] (UInt64 base, int power_of_two) mutable
    {
        ++buf.position();
        if (buf.eof())
        {
            x *= base; 
        }
        else if (*buf.position() == 'i')
        {
            x = (x << power_of_two); 
            ++buf.position();
        }
        return;
    };
    switch (*buf.position())
    {
        case 'k': [[fallthrough]];
        case 'K':
            finish(1000, 10);
            break;