Remove unused Python variables

contrib/testgen/base58.py

@@ -84,7 +84,6 @@ def b58decode_chk(v):
     result = b58decode(v)
     if result is None:
         return None
-    h3 = checksum(result[:-4])
     if result[-4:] == checksum(result[:-4]):
         return result[:-4]
     else:

contrib/testgen/gen_base58_test_vectors.py

@@ -45,7 +45,6 @@ def is_valid(v):
     result = b58decode_chk(v)
     if result is None:
         return False
-    valid = False
     for template in templates:
         prefix = str(bytearray(template[0]))
         suffix = str(bytearray(template[2]))