Fixes stdout bug.

Bug: 182843932
Test: Tested locally.
Change-Id: Ic57eff56a4d7dbcc034a2bfe18a2c1de297b00d5
diff --git a/acts/framework/acts/controllers/bits_lib/bits_client.py b/acts/framework/acts/controllers/bits_lib/bits_client.py
index 11ed3e0..f33c44b 100644
--- a/acts/framework/acts/controllers/bits_lib/bits_client.py
+++ b/acts/framework/acts/controllers/bits_lib/bits_client.py
@@ -284,7 +284,7 @@
         """
         self._log.debug('listing devices')
         result = self.run_cmd('--list', 'devices', timeout=20)
-        return result.stdout
+        return result
 
     def list_channels(self, collection_name):
         """Finds all the available channels in a given collection.