[Pkg-freeradius-maintainers] Bug#962996: libhiredis0.14 renamed funcion

[Gang Chen]

This bug is caused by libhiredis0.14-0.14.0-3 renaming
redisReplyReaderGetError to redisReaderGetError.

freeradius-redis may be compiled with another version (<0.14) of libhiredis.

libhiredis CHANGELOG:
https://github.com/redis/hiredis/blob/3af99d5fd5c2352cd73e851686bb18de122897f1/CHANGELOG.md#0140-2018-09-25

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