[BUGS] BUG #14468: One byte buffer overlow in quote_literal_cstr()

The following bug has been logged on the website:

Bug reference:      14468
Logged by:          Heikki Linnakangas
Email address:      hlinnaka@iki.fi
PostgreSQL version: 9.6.1
Operating system:   All
Description:

postgres=# select format('%L', E'\\');
WARNING:  detected write past chunk end in ExprContext 0x55c65ff98fa8
 format 
--------
 E'\\'
(1 row)


This was originally reported against Greenplum, at
https://github.com/greenplum-db/gpdb/issues/1301. The code there isn't quite
the same, but it turned out to be a shared bug.

Looking at quote_literal_cstr(), it simply doesn't take into account the
space needed for the NULL terminator, when it allocates the buffer. The fix
is a straightforward + 1 to the allocation. I'll go and do that shortly, and
backpatch.


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