Exit after fatal errors in client-side compression code.

It looks like whoever wrote the astreamer (nee bbstreamer) code
thought that pg_log_error() is equivalent to elog(ERROR), but
it's not; it just prints a message.  So all these places tried to
continue on after a compression or decompression error return,
with the inevitable result being garbage output and possibly
cascading error messages.  We should use pg_fatal() instead.

These error conditions are probably pretty unlikely in practice,
which no doubt accounts for the lack of field complaints.

Author: Tom Lane <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 15

Branch
------
REL_17_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8b198b093fd2ccc2712f6b5a43665818310698f4

Modified Files
--------------
src/bin/pg_basebackup/bbstreamer_gzip.c |  2 +-
src/bin/pg_basebackup/bbstreamer_lz4.c  | 20 ++++++++++----------
src/bin/pg_basebackup/bbstreamer_zstd.c | 19 ++++++++-----------
src/bin/pg_dump/compress_lz4.c          | 13 +++++++++++--
4 files changed, 30 insertions(+), 24 deletions(-)

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