scripts/kernel-doc: check that non-void fcts describe their return value

If a function has a return value, but its kernel-doc comment doesn't contain a
"Return" section, then emit the following warning:

   Warning(file.h:129): No description found for return value of 'fct'

Note: This check emits a lot of warnings at the moment, because many functions
don't have a 'Return' doc section. So until the number of warnings goes
sufficiently down, the check is only performed in verbose mode.

Signed-off-by: Yacine Belkadi <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Signed-off-by: Michal Marek <[email protected]>

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