Pass by pointer and release of lex ranges.
Pass by pointer and release of lex ranges.

Given that the code was written with a 2 years pause... something
strange happened in the middle. So there was no function to free a
lex range min/max objects, and in some places the range was passed by
value.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis