fix 1006 command wim-show tries to load json twice

Change-Id: Ie444c6856c2541d207432ca98d0cbedccd91c192
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/osmclient/sol005/wim.py b/osmclient/sol005/wim.py
index 90632c6..f9d2431 100644
--- a/osmclient/sol005/wim.py
+++ b/osmclient/sol005/wim.py
@@ -235,7 +235,7 @@
                 resp =  json.loads(resp)
             if not resp or '_id' not in resp:
                 raise ClientException('failed to get wim info: '.format(resp))
-            return json.loads(resp)
+            return resp
         except NotFound:
             raise NotFound("wim '{}' not found".format(name))