Implement proper error handling.

Instead of calling abort() if vasprintf() fails, and ignoring possible
errors from the JSON library, do handle errors reasonably sanely:
check return values, and return an error state from all functions, and
propagate it up to the application level, too.

This means that the legacy overrides will silently fail, but set errno
appropriately in case serializing to JSON fails, and do what the
system libc does with syslog otherwise.

The new functions can return NULL or non-zero on error, which the
application can then handle as it sees fit.

Signed-off-by: Gergely Nagy <algernon@balabit.hu>

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