c-index-test.c: Make C89-compliant.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169277 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/c-index-test/c-index-test.c b/tools/c-index-test/c-index-test.c
index 5ca148f..c651510 100644
--- a/tools/c-index-test/c-index-test.c
+++ b/tools/c-index-test/c-index-test.c
@@ -1140,10 +1140,11 @@
 
 static enum CXChildVisitResult PrintBitWidth(CXCursor cursor, CXCursor p,
                                              CXClientData d) {
+  int Bitwidth;
   if (clang_getCursorKind(cursor) != CXCursor_FieldDecl)
     return CXChildVisit_Recurse;
 
-  int Bitwidth = clang_getFieldDeclBitWidth(cursor);
+  Bitwidth = clang_getFieldDeclBitWidth(cursor);
   if (Bitwidth >= 0) {
     PrintCursor(cursor, NULL);
     printf(" bitwidth=%d\n", Bitwidth);