Fix error mappings for IOV MIC mechglue funcs

Fix error mappings for IOV MIC mechglue funcs

The mechglue functions gss_get_mic_iov(), gss_get_mic_iov_length(),
and gss_verify_mic_iov() don't call map_error() to map
mechanism-specific error codes.  As a result, a subsequent call to
gss_display_status() fails with GSS_S_BAD_MECH, because no translation
for the error code is found in the error table.

This patch adds the missing map_error call.

[ghudson@mit.edu: correct a whitespace issue, edit commit message]

ticket: 8246 (new)
target_version: 1.13.3
tags: pullup