*src/syntax.c: catch some allocation errors
*src/syntax.c: catch some allocation errors

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