[Bug middle-end/56978] memset-chk.c failure since r197671

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56978

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-04-16 11:13:46 UTC ---
Related to PR56921?  Can you try the attached patch?