Integer overflow at line 1603 in the src/operator.c file

## Summary: [add summary of the vulnerability] On systems with a 64 bit, if —retry-max-time > 18446744073709552, config->retry-max-time*1000L will be overflow at line 1603 in the src/operator.c file. Similarly, the same is true for 32-bit operating systems. ## Steps To Reproduce: [add details for how we can reproduce the issue] 1. [add step] run: curl --retry-max-time 18446744073709552 -v 127.0.0.1:8080/test.html 1. [add step] 1. [add step] ## Supporting Material/References: [list any additional material (e.g. screenshots, logs, etc.)] * [attachment / reference] ## Impact If the integer overflow is triggered, the parameter retry-max-time will be illegal.