src: Fix compiler warnings

src/HttpServer.cc

@@ -1288,7 +1288,7 @@ void prepare_response(Stream *stream, Http2Handler *hd,
     p = std::copy(std::begin(htdocs), std::end(htdocs), p);
     p = std::copy(std::begin(path), std::end(path), p);
     if (trailing_slash) {
-      p = std::copy(std::begin(DEFAULT_HTML), std::end(DEFAULT_HTML), p);
+      std::copy(std::begin(DEFAULT_HTML), std::end(DEFAULT_HTML), p);
     }
   }
 

src/util.cc

@@ -797,8 +797,9 @@ std::vector<unsigned char> get_default_alpn() {
 std::vector<StringRef> split_str(const StringRef &s, char delim) {
   size_t len = 1;
   auto last = std::end(s);
-  for (auto first = std::begin(s), d = first;
-       (d = std::find(first, last, delim)) != last; ++len, first = d + 1)
+  StringRef::const_iterator d;
+  for (auto first = std::begin(s); (d = std::find(first, last, delim)) != last;
+       ++len, first = d + 1)
     ;
 
   auto list = std::vector<StringRef>(len);