pgsql: Use failure-safe pg_malloc consistently in psql/print.c.

Log Message:
-----------
Use failure-safe pg_malloc consistently in psql/print.c.

Modified Files:
--------------
pgsql/src/bin/psql:
print.c (r1.61 -> r1.62)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/print.c.diff?r1=1.61&r2=1.62)