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eina: specify error returns in @return for eina_list API docs

Authored by bryceharrington on Mar 6 2018, 4:56 PM.

Description

eina: specify error returns in @return for eina_list API docs

Summary:
For all routines that can return NULL on error, mention this in the
function's @return docs. In cases where a small number of situations
result in this return, move the docs to the @return; in other cases just
state the NULL return briefly and leave the elaboration in the body.

Reviewers: cedric

Differential Revision: https://phab.enlightenment.org/D5837

Signed-off-by: Cedric Bail <cedric@osg.samsung.com>