Merge branch 'jk/vreport-sanitize'

An error message with an ASCII control character like '\r' in it
can alter the message to hide its early part, which is problematic
when a remote side gives such an error message that the local side
will relay with a "remote: " prefix.

* jk/vreport-sanitize:
vreport: sanitize ASCII control chars
Revert "vreportf: avoid intermediate buffer"