* src/augeas.c (aug_setm): do not segfault when sub is NULL
* src/augeas.c (aug_setm): do not segfault when sub is NULL

manandbytes/augeas,mchf/augeas,jtopjian/augeas,dafugg/augeas,domcleal/augeas,GeoffWilliams/augeas,hercules-team/augeas-do-not-use,ptoscano/augeas,kumy/augeas,MikaelSmith/augeas,hercules-team/augeas,dafugg/augeas,mlichvar/augeas,jasperla/augeas,kumy/augeas,hercules-team/augeas-do-not-use,domcleal/augeas,kunkku/augeas,mlichvar/augeas,jjlin/augeas,lutter/augeas,domcleal/augeas,mlichvar/augeas,jtopjian/augeas,raphink/augeas,jjlin/augeas,kunkku/augeas,ptoscano/augeas,kumy/augeas,hercules-team/augeas,pevalme/augeas,jjlin/augeas,GeoffWilliams/augeas,pevalme/augeas,kunkku/augeas,lutter/augeas,lutter/augeas,jasperla/augeas,MikaelSmith/augeas,hercules-team/augeas-do-not-use,mchf/augeas,manandbytes/augeas,ptoscano/augeas,pevalme/augeas,kumy/augeas,dafugg/augeas,raphink/augeas