libiscsi: fix build failures due to warnings

Retrieve two upstream patches to fix build failures due to warnings

Fixes:
 - http://autobuild.buildroot.org/results/7ec1e1cc060bbdaaf758c0d55a053247b731e792



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>