PR objc++/68932  - FAIL: obj-c++.dg/property/at-property-23.mm -fgnu-runtime
                   (internal compiler error)

cp/
	* decl.c (grokdeclarator): Avoid assuming ctype is non-null when
	checking the validity of a flexible array member.

testsuite/
	* obj-c++.dg/property/at-property-23.mm: Remove check for
	an error message.

From-SVN: r231726