[Bug testsuite/85888] [9 Regression] New test case c-c++-common/attr-nonstring-6.c from r260541 fails with excess errors

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85888

--- Comment #7 from seurer at gcc dot gnu.org ---
This same error just popped up on gcc 8 (r261152 for gcc 8 backported r260541
for trunk) so don't forget about this fix as well.