[lib] Marked unused return value as UNUSED.
[lib] Marked unused return value as UNUSED.

This should resolve several Coverity warnings such as CID #1279.

FROGGS/parrot,gitster/parrot,youprofit/parrot,youprofit/parrot,tewk/parrot-select,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,tewk/parrot-select,gitster/parrot,parrot/parrot,tewk/parrot-select,tkob/parrot,gagern/parrot,parrot/parrot,gitster/parrot,gagern/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,gagern/parrot,parrot/parrot,tewk/parrot-select,gitster/parrot,gitster/parrot,tewk/parrot-select,FROGGS/parrot,tewk/parrot-select,gagern/parrot,tewk/parrot-select,gagern/parrot,tkob/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,gitster/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,FROGGS/parrot,tkob/parrot,gagern/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,gitster/parrot