document_db.cc: fix assert

Check for lhs and not twice for rhs.

Fix for:

[utilities/document/document_db.cc:36] ->
 [utilities/document/document_db.cc:36]: (style) Same expression on both
 sides of '&&'.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

utilities/document/document_db.cc

@@ -33,7 +33,7 @@ namespace {
 // > 0   <=>  lhs == rhs
 // TODO(icanadi) move this to JSONDocument?
 int DocumentCompare(const JSONDocument& lhs, const JSONDocument& rhs) {
-  assert(rhs.IsObject() == false && rhs.IsObject() == false &&
+  assert(lhs.IsObject() == false && rhs.IsObject() == false &&
          lhs.type() == rhs.type());
 
   switch (lhs.type()) {