Crash in qUncompress when Z_BUF_ERROR occurs in zlib.

Use some data to decompress where the expected size (read from the first 4 bytes of the array) is smaller than the real size of the decompressed array.
The application stops with corruption of the heap memory.

I assume the problem lies in qbytearray.cpp in line 543:
d.reset(q_check_ptr(static_cast<QByteArray::Data *>(qRealloc(d.data(), sizeof(QByteArray::Data) + alloc))));

The realloc sometimes move the memory pointer. When this happen the q_check_ptr tries to free the memory at the previous pointer.
That does not work because it is not necessary to free the memory here.

This is reproducible when Z_BUF_ERROR (line 573) occurs and as a result of that the line 543 is called twice or more times.