[gssproxy] [PATCH] Fix possible crashes in gssapi

[Simo Sorce]

The mechglue expects the outputs to be zeroed by the mechanism even
though it allocates the gss_buffer_t structure.
Failing to do may lead to a segfault in free() if the display_name
function returns an error.

Simo.

-- 
Simo Sorce * Red Hat, Inc * New York