From: Julia Lawall <Julia.Lawall@inria.fr>
Date: Sun, 26 Jul 2020 12:58:29 +0200

list_for_each_entry is able to handle an empty list.
The only effect of avoiding the loop is not initializing the
index variable.
Drop list_empty tests in cases where these variables are not
used.

Note that list_for_each_entry is defined in terms of list_first_entry,
which indicates that it should not be used on an empty list.  But in
list_for_each_entry, the element obtained by list_first_entry is not
really accessed, only the address of its list_head field is compared
to the address of the list head, so the list_first_entry is safe.

The semantic patch that makes this change is as follows (with another
variant for the no brace case): (http://coccinelle.lip6.fr/)

 ...

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>

Saeed, please pick this up.

Thank you.