fix testcase

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@118155 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/testsuite/g++.dg/warn/Wchar-subscripts-2.C

@@ -2,9 +2,11 @@
 // { dg-do compile }
 // { dg-options "-Wchar-subscripts" }
 
+extern volatile char bla;
+
 char foo (const char *s)
 {
-    return s [s ['\x80']];          // { dg-warning "array subscript" }
+    return s [bla];          // { dg-warning "array subscript" }
 }
 
 int main ()