Fix allocation size overflow check in CowData

[AThousandShips]

For large input data, the next power of two check can return 0, causing the allocation size to not be valid, this ensures that it fails if that is the case.

Will look into adding error checks to code that uses resize on things and then depends on it being successful, but taking that in a separate PR

• Fixes: No nullptr check in cowdata - crash to desktop #81911 (This partially fixes it, the specific case will still crash as the internal string operations do not check for errors after resize, can add that too but felt this was a specific fix to core)

[akien-mga]

Thanks!

[AThousandShips]

Thank you!

[YuriSizov]

Cherry-picked for 4.1.4.