Fix invalid memory access in scanner on unbalanced parentheses
Fix invalid memory access in scanner on unbalanced parentheses

Fixes bug 601789.

GNOME/vala,jessevdk/vala,flobrosch/vala-fixes,themiwi/vala,severinh/vala,rvu95/vala,kamanashisroy/aroop,themiwi/vala,flobrosch/vala-fixes,phako/vala,phako/vala,frida/vala,jessevdk/vala,kamanashisroy/aroop,playya/vala,spidermonkdust/vala,Distrotech/vala,rvu95/vala,playya/vala,Distrotech/vala,GNOME/vala,rvu95/vala,xdave/pvala,tjol/vala-tjol,spidermonkdust/vala,frida/vala,kamanashisroy/aroop,themiwi/vala,Distrotech/vala,spidermonkdust/vala,playya/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,Jc2k/vala,severinh/vala,flobrosch/vala-fixes,tjol/vala-tjol,Jc2k/vala,tjol/vala-tjol,GNOME/vala,severinh/vala,jessevdk/vala