kbuild: Fix missing _coverage definition

Signed-off-by: Denys Fedoryshchenko <[email protected]>

Author: nuclearcat

kernelci/kbuild.py

@@ -243,6 +243,7 @@ def __init__(self, node=None, jobname=None, params=None, jsonobj=None, apiconfig
             self._full_artifacts = jsonobj['full_artifacts']
             self._dtbs_check = jsonobj['dtbs_check']
             self._kfselftest = jsonobj['kfselftest']
+            self._coverage = jsonobj.get('coverage', False)
             return
         raise ValueError("No valid arguments provided")