doc/sphinx: Pass right filename as source

With this error output becomes almost readable. The line numbers are
still totally bonghits, but that's a lot harder to pull out of
kerneldoc. We'd essentially have to insert some special markers in the
kernel-doc output, split the output along these markers and then
insert each block separately using

     state_machine.insert_input(block, source, first_line)

Cc: Jani Nikula <[email protected]>
Cc: [email protected]
Cc: Jonathan Corbet <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>

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