tests: Return result from WpaSupplicant::global_request() in all cases

The no self.global_iface case was not returning the result from the
self.request() case. While this is not really a path that is supposed to
be used, make it return the response since it is at least theoretically
possible to get here.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/wpasupplicant.py

@@ -135,7 +135,7 @@ class WpaSupplicant:
 
     def global_request(self, cmd):
         if self.global_iface is None:
-            self.request(cmd)
+            return self.request(cmd)
         else:
             ifname = self.ifname or self.global_iface
             logger.debug(ifname + ": CTRL(global): " + cmd)