cmocka: Print better message for exceptions.
cmocka: Print better message for exceptions.

jhrozek/cmocka,dsch/cmocka,tyc/cmocka,nuumio/cmocka,JonathonReinhart/cmocka,lsjostro/cmocka,jamesmunns/CMocka,clibs/cmocka,tyc/cmocka,VladimirTyrin/cmocka,JonathonReinhart/cmocka,jamesmunns/CMocka,jschmidlapp/cmocka,tyc/cmocka,Odie/cmocka,wingyplus/cmocka,wingyplus/cmocka,Odie/cmocka,nuumio/cmocka,clibs/cmocka,jhrozek/cmocka,jschmidlapp/cmocka,dsch/cmocka,lsjostro/cmocka,jhrozek/cmocka,jschmidlapp/cmocka,VladimirTyrin/cmocka,Odie/cmocka,nuumio/cmocka