Bug #1128: Deletion of unnecessary checks before calls of the function “archive_entry...

Bug #1128: Deletion of unnecessary checks before calls of the function “archive_entry_free”

The function “archive_entry_free” is implemented in the way that only
two functions are called which tolerate the passing of null pointers.
It is therefore not needed that a function caller repeats a corresponding check.

This issue was fixed by using the software “Coccinelle 1.0.7”.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>