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8e89e0b89f
`VSIM_RedisCommand` in `vset.c` had two memory leak bugs related to the compiled FILTER expression (`exprstate` allocated by `exprCompile`): 1. Duplicate FILTER: When two FILTER options are provided in a single VSIM command, the second `exprCompile` overwrites `filter_expr` without freeing the first. Only the last one is freed in `VSIM_execute cleanup`. Fix: call `exprFree` on the existing `filter_expr` before reassigning. 2. Error path leaks: When FILTER is parsed successfully but a later option fails validation (invalid COUNT/EF/EPSILON/FILTER-EF or unknown option), the error return frees `vec` but not `filter_expr`. Fix: add `exprFree(filter_expr)` to all five error return paths.