libpq: Make error checks in the new buffer draining code more robust

Check explicitly for pqsecure_read() returning an error. It shouldn't
fail, and we would've caught it in the check for a short read, but
better to be explicit so that the error message is more informative.
We also shouldn't update 'inEnd' when the read fails, although that
too is just pro forma as we will bail out and close the connection on
error.

Reported-by: Peter Eisentraut <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/[email protected]
Backpatch-through: 14

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/87c3a79ea206410f34f326eb63c36d8679edeb8b

Modified Files
--------------
src/interfaces/libpq/fe-misc.c   | 11 ++++++++---
src/interfaces/libpq/fe-secure.c |  5 +++--
2 files changed, 11 insertions(+), 5 deletions(-)

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