Fix two thinkos related to strong random keys.

pg_backend_random() is used for MD5 salt generation, but it can fail, and
no checks were done on its status code.

Fix memory leak, if generating a random number for a cancel key failed.

Both issues were spotted by Coverity. Fix by Michael Paquier.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/41493bac36575c93172644d0eab7045aed8dcc17

Modified Files
--------------
src/backend/libpq/auth.c            | 7 ++++++-
src/backend/postmaster/postmaster.c | 1 +
2 files changed, 7 insertions(+), 1 deletion(-)


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