fix(storage/qemu): Adjust configure return value

Looks like it is currently unused, though.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

mtda/storage/qemu.py

@@ -33,7 +33,7 @@ def configure(self, conf):
         self.mtda.debug(3, "storage.qemu.configure()")
         self.lock.acquire()
 
-        result = None
+        result = True
         if 'file' in conf:
             self.file = os.path.realpath(conf['file'])
         d = os.path.dirname(self.file)