Revert "roomservice: Do not overwrite existing devices"

This reverts commit ec984864424f785470ee5f1ccb7e1743e1360098.

Change-Id: Ic1294fedf2f04c10356270c87046c1f571e71e1f
diff --git a/build/tools/roomservice.py b/build/tools/roomservice.py
index 6e20d37..60fccd0 100755
--- a/build/tools/roomservice.py
+++ b/build/tools/roomservice.py
@@ -370,7 +370,6 @@
 def fetch_device(device):
     if check_device_exists(device):
         print("WARNING: Trying to fetch a device that's already there")
-        return
     git_data = search_gerrit_for_device(device)
     if git_data is not None:
         device_url = git_data['id']