Fix incorrect parameter name in prototype
The function declaration for select_next_encryption_method use the
variable name have_valid_connection, so fix the prototype in the
header to match that.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/
3F577953-A29E-4722-98AD-
2DA9EFF2CBB8@yesql.se