Ambiguous bool to int conversion

This is triggered by clang -Wint-in-bool-context

```
XMPFiles/source/FileHandlers/FLV_Handler.cpp:200:55: warning: converting the result of '<<' to a boolean; did you mean '(buffer[7] << 24) != 0'? [-Wint-in-bool-context]
info->time = GetUns24BE ( &buffer[4] ) || (buffer[7] << 24);
^
1 warning generated.
```

### Expected Behaviour

Properly written code, no warning.

### Actual Behaviour

Seems to want to put a `bool` value into an `XMP_Uns32` with implicit conversion. Seems to be wrong.

### Reproduce Scenario (including but not limited to)

#### Steps to Reproduce

Build with clang (Linux) with `-Wint-in-bool-context`

#### Platform and Version

clang version 13.0.0 (Fedora 13.0.0-3.fc35)

#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Start at XMPFiles/source/FileHandlers/FLV_Handler.cpp:200 and inspect how the FLV buffer values are used in the assignment to info->time. Build the project with clang and -Wint-in-bool-context to reproduce the warning. Done means the warning is removed while the existing FLV timestamp behavior remains correct.

Written by the indexing model from the issue text.