[staticanalysis]: Add missing va_end()
[staticanalysis]: Add missing va_end()

https://bugzilla.gnome.org/show_bug.cgi?id=732020

gatispaeglis/ostree,sujitfulse/ostree,GNOME/ostree,leandrosansilva/ostree,leandrosansilva/ostree,gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,sujitfulse/ostree,gatispaeglis/ostree,leandrosansilva/ostree,resin-io/ostree,sujitfulse/ostree,sujitfulse/ostree,resin-io/ostree,GNOME/ostree,resin-io/ostree,resin-io/ostree,GNOME/ostree,sujitfulse/ostree,GNOME/ostree,resin-io/ostree,gatispaeglis/ostree,GNOME/ostree,leandrosansilva/ostree,leandrosansilva/ostree