pgsql: fe_utils: Sprinkle some pg_malloc_object() and pg_malloc_array()

fe_utils: Sprinkle some pg_malloc_object() and pg_malloc_array()

The idea is to encourage more the use of these allocation routines
across the tree, as these offer stronger type safety guarantees than
pg_malloc() & friends (type cast in the result, sizeof() embedded).
This commit updates some code paths of src/fe_utils/.

This commit is similar to 31d3847a37be.

Author: Henrik TJ <henrik(at)0x48(dot)dk>
Reviewed-by: Andreas Karlsson <andreas(at)proxel(dot)se>
Discussion: https://postgr.es/m/6df1b64e-1314-9afd-41a3-3fefb76225e1@0x48.dk

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ff393fa526648c091a3492da3bd6dd140e3c55e7

Modified Files
--------------
src/fe_utils/conditional.c | 4 ++--
src/fe_utils/print.c | 48 +++++++++++++++++++++++-----------------------
src/fe_utils/psqlscan.l | 8 ++++----
src/fe_utils/simple_list.c | 4 ++--
4 files changed, 32 insertions(+), 32 deletions(-)