Fix issue RedisLabs#211. Allow key_stddev and key_median options to be set values

exceeding unsigned int.

Author: clkbug

memtier_benchmark.cpp

@@ -694,15 +694,15 @@ static int config_parse_args(int argc, char *argv[], struct benchmark_config *cf
                     break;
                 case o_key_stddev:
                     endptr = NULL;
-                    cfg->key_stddev = (unsigned int) strtof(optarg, &endptr);
+                    cfg->key_stddev = strtoull(optarg, &endptr, 10);
                     if (cfg->key_stddev<= 0 || !endptr || *endptr != '\0') {
                         fprintf(stderr, "error: key-stddev must be greater than zero.\n");
                         return -1;
                     }
                     break;
                 case o_key_median:
                     endptr = NULL;
-                    cfg->key_median = (unsigned int) strtof(optarg, &endptr);
+                    cfg->key_median = strtoull(optarg, &endptr, 10);
                     if (cfg->key_median<= 0 || !endptr || *endptr != '\0') {
                         fprintf(stderr, "error: key-median must be greater than zero.\n");
                         return -1;