Use explicit_bzero() when clearing sslpassword in libpq
Since
74a308c, any security-sensitive information gets cleared from
memory this way. This was forgotten in
4dc6355.
Author: Daniel Gustafsson
Reviewed-by: Peter Eisentraut, Michael Paquier
Discussion: https://postgr.es/m/
935443BA-D42E-4CE0-B181-
1AD79E6DD45A@yesql.se