[FIX] base_vat: properly return vat check for HU VAT

Before the fix the check function is assigned a boolean, which causes an
error when trying to call the function.

After the fix the result of the check is returned.

closes odoo/odoo#139407

X-original-commit: ea2798c5893373d79f70959e4501d0eef4f964b7
Signed-off-by: William André (wan) <wan@odoo.com>

addons/base_vat/models/res_partner.py

@@ -306,9 +306,7 @@ class ResPartner(models.Model):
         if individual:
             return True
         # Check the vat number
-        check_func = stdnum.util.get_cc_module('hu', 'vat').is_valid(vat)
-        if check_func is not None:
-            return check_func(vat)
+        return stdnum.util.get_cc_module('hu', 'vat').is_valid(vat)
 
     __check_vat_ch_re = re.compile(r'E([0-9]{9}|-[0-9]{3}\.[0-9]{3}\.[0-9]{3})(MWST|TVA|IVA)$')