Missing return REDIS_ERR added to processMultibulkBuffer().
Missing return REDIS_ERR added to processMultibulkBuffer().

When we set a protocol error we should return with REDIS_ERR to let the
caller know it should stop processing the client.

Bug found in a code auditing related to issue #1699.

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