the removal of 'x' in "\x" corrupts data

[mydimension]

I have data in a table the holds valid hex \x sequences (e.g. "\x1b" for an encoded [ESC] character). The following code in quote_escape_json seems to be the culprit:

/* XXX suppress \x in bytea field? */
if (ch == '\\' && *(valptr + 1) == 'x')
{
	valptr++;
	continue;
}

With this, my "\x1b" value is emitted from this plugin as "\1b".

Even if this is right thing to do for bytea values (not convinced it is), it is not correct for other textual data.

[eulerto]

I've already detected this problem while working in another patch. I'll fix it.