tests/avocado/mem-addr-space-check: Remove unused "import signal"

The "signal" module is not used here, so we can remove this import
statement.

Message-ID: <20240719095408.33298-1-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/tests/avocado/mem-addr-space-check.py b/tests/avocado/mem-addr-space-check.py
index 85541ea..d397459 100644
--- a/tests/avocado/mem-addr-space-check.py
+++ b/tests/avocado/mem-addr-space-check.py
@@ -9,7 +9,6 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 from avocado_qemu import QemuSystemTest
-import signal
 import time
 
 class MemAddrCheck(QemuSystemTest):