Segmentation fault fixed as get_num_chunks could sometimes be larger than get_chunks.size().

src/CompletionString.cc

@@ -13,13 +13,11 @@ get_num_chunks() {
 std::vector<clang::CompletionChunk> clang::CompletionString::
 get_chunks() {
   std::vector<clang::CompletionChunk> res;
-  if (clang_getCompletionAvailability(str_) == CXAvailability_Available) {
   for (auto i = 0; i < get_num_chunks(); i++) {
     res.emplace_back(clang_getCString(clang_getCompletionChunkText(str_, i)),
                      static_cast<CompletionChunkKind>
                      (clang_getCompletionChunkKind(str_, i)));
   }
-  }
   return res;
 }