ilence compiler warnings

In GetCachedPlan(), initialize 'plan' to silence a compiler warning, but
also add an Assert() to make sure we don't ever actually fall through
with 'plan' still being set to NULL, since we are about to dereference
it.

Back-patch back to 9.2.

Author: Stephen Frost
Discussion: https://postgr.es/m/20161129152102.GR13284%40tamriel.snowman.net

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/fce04516ec5e34dcad18d1dc60e1373a292c218e

Modified Files
--------------
src/backend/utils/cache/plancache.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)


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