http2: remove duplicate codeblock

PR-URL: #55915
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jason Zhang <xzha4350@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

Author: AVVS

src/node_http2.cc

@@ -1316,11 +1316,7 @@ int Http2Session::OnDataChunkReceived(nghttp2_session* handle,
     } else {
       memcpy(buf.base, data, avail);
     }
-    if (buf.base == nullptr) [[likely]] {
-      buf.base = reinterpret_cast<char*>(const_cast<uint8_t*>(data));
-    } else {
-      memcpy(buf.base, data, avail);
-    }
+
     data += avail;
     len -= avail;
     stream->EmitRead(avail, buf);