Fix typo in redis.h
Fix typo in redis.h

Closes #1386

ttuna/msot-redis,ramonsnir/redis,ttuna/msot-redis,maodeyi/redis_lua,spearhead-ea/redis,ksarch-saas/redis,himoca/redis,splitice/redis,ramonsnir/redis,maodeyi/redis_lua,ksarch-saas/redis,louisliangjun/redis,xuzhezhaozhao/redis_reading,HunanTV/redis,maodeyi/redis_lua,jxwr/redis,slfs007/mk-redis,louisliangjun/redis,MSOpenTech/redis,HunanTV/redis,ksarch-saas/redis,xuzhezhaozhao/redis_reading,MSOpenTech/redis,HunanTV/redis,splitice/redis,jxwr/redis,ttuna/msot-redis,darksideofthemoo/redis-histogram,jxwr/redis,ksarch-saas/redis,louisliangjun/redis,ttuna/msot-redis,MSOpenTech/redis,xuzhezhaozhao/redis_reading,louisliangjun/redis,HunanTV/redis,himoca/redis,ramonsnir/redis,slfs007/mk-redis,MSOpenTech/redis,darksideofthemoo/redis-histogram,darksideofthemoo/redis-histogram,spearhead-ea/redis,xuzhezhaozhao/redis_reading,himoca/redis,spearhead-ea/redis,splitice/redis,MSOpenTech/redis,splitice/redis,darksideofthemoo/redis-histogram,ttuna/msot-redis,slfs007/mk-redis