tests: Silence unnecessary get_driver_status() prints

Commit 53606b105c ('tests: Wait for scan
to complete on all interfaces in reset()') added option of passing
ifname to get_driver_status(). This could result in FAIL-NO-IFNAME-MATCH
returns that get printed out in "Ignore unexpected status-driver line"
messages if the interface is not found. Check for this case to avoid
that unnecessary print.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/wpasupplicant.py

@@ -362,6 +362,8 @@ class WpaSupplicant:
             res = self.request("STATUS-DRIVER")
         else:
             res = self.global_request("IFNAME=%s STATUS-DRIVER" % ifname)
+            if res.startswith("FAIL"):
+                return dict()
         lines = res.splitlines()
         vals = dict()
         for l in lines: