CF_GetClipboard may crash in Lua, if buf_sz=20000000000000

[mespotine]

The following call of CF_GetClipboard causes problems in Reaper:

A,B = reaper.CF_GetClipboard("",20000000000000)

This either crashes Reaper completely or freezes the Lua-instance of the script. Means, if I try to run the script, it will not run until I restart Reaper.
Maybe some sanity checks would be a good idea.

[cfillion]

There's a check but it only guards against large positive numbers. 20000000000000, as a signed 32-bit integer, is -1662697472 which slips right through it. Thanks, fixing!

[cfillion]

It turns out it's the change that allowed omitting the buf/buf_sz parameters that is letting this happen (the buffer fails to be resized to fit the clipboard data).