Fix unchecked return value from strdup
The pg_dump compression was using strdup() instead of pg_strdup()
and failed to check the returned pointer for out-of-memory before
dereferencing it. Fix by using pg_strdup() instead which probably
was the intention here in the original patch.
Backpatch to v16 where pg_dump compression was introduced.
Reviewed-by: Tristan Partin <tristan@neon.tech>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/
CC661D60-6F4C-474D-B9CF-
E789ACA3CEFC@yesql.se
Backpatch-through: 16