[Bug tapsets/18263] In tty tapset, driver_name can be null, causing a script to fail when probing tty.write or tty.read

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18263

--- Comment #2 from David Smith <dsmith at redhat dot com> ---
(In reply to David Smith from comment #1)
> Perhaps we need a kernel_string3() function, which would look like this:
> 
> ====
> function kernel_string3:string (addr:long) {
>   try { return kernel_string(addr) } catch { return sprintf("%p", addr) }
> }
> ====
> 
> This would either return the string or return the failing address.

Strangely enough, the above matches the behavior of kernel_string_quoted, which
also either returns the quoted string or the failing address.

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