Convert bools to int before arithmetic

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/tests/scripts/generate_bignum_tests.py b/tests/scripts/generate_bignum_tests.py
index 757a80a..471fd77 100755
--- a/tests/scripts/generate_bignum_tests.py
+++ b/tests/scripts/generate_bignum_tests.py
@@ -131,7 +131,7 @@
 
     def __init__(self, val_l, val_r):
         super().__init__(val_l, val_r)
-        self._result = (self.int_l > self.int_r) - (self.int_l < self.int_r)
+        self._result = int(self.int_l > self.int_r) - int(self.int_l < self.int_r)
         self.symbol = ["<", "==", ">"][self._result + 1]
 
     def result(self):