[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" <sourceware-bugzilla at sourceware dot org>]

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

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
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   Attachment #8248|0                           |1
        is obsolete|                            |

--- Comment #4 from David Smith <dsmith at redhat dot com> ---
Created attachment 8249
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8249&action=edit
kernel_string_quoted patch

Here's a better patch that replaces all use of kernel_string() with
kernel_string_quoted() in tty.stp. The problem with kernel_string3() is that it
if returned "0x0" you can't know if the string was NULL or if the string was
actually "0x0".

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