test_saslprep: Fix issue with copy of input bytea

The data given in input of the function may not be null-terminated,
causing strlcpy() to complain with an invalid read.

Issue spotted using valgrind.

Reported-by: Alexander Lakhin <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/5d35531af1840fdd8debfc1ff657643ddba029ab

Modified Files
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src/test/modules/test_saslprep/test_saslprep.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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