Remove unused line

Change-Id: Ic4742430320e29b7f70f124c20cf9e515678f007
Reviewed-on: https://weave-review.googlesource.com/2390
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

src/privet/auth_manager.cc

diff --git a/src/privet/auth_manager.cc b/src/privet/auth_manager.cc
index 71a4f39..f3d32f5 100644
--- a/src/privet/auth_manager.cc
+++ b/src/privet/auth_manager.cc
@@ -320,7 +320,6 @@
       {
           &scope.GetCaveat(), &user.GetCaveat(), &expiration.GetCaveat(),
       });
-  return {};
 }
 
 bool AuthManager::ParseAccessToken(const std::vector<uint8_t>& token,