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Backport the following commit to fix upstream bug 25976:

790b8dda4455865cb8c3a47801f4304c1a43baf6
nss_compat: internal_end*ent may clobber errno, hiding ERANGE [BZ #25976]

This also improves failure modes involving the SSSD NSS plugin, see:
https://bugzilla.redhat.com/show_bug.cgi?id=1402403

Also we don't want to regress the fix in RHEL 7.9:
https://bugzilla.redhat.com/show_bug.cgi?id=1834816