Fix the bounds check for the --readwritepercent option

Summary:
see above

Task ID: #

Blame Rev:

Test Plan:
run db_bench with invalid value for option

Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: dhruba

Reviewed By: dhruba

CC: heyongqiang

Differential Revision: https://reviews.facebook.net/D5823

db/db_bench.cc

@@ -1205,7 +1205,7 @@ int main(int argc, char** argv) {
                (n == 0 || n == 1)) {
       FLAGS_sync = n;
     } else if (sscanf(argv[i], "--readwritepercent=%d%c", &n, &junk) == 1 &&
-               (n > 0 || n < 100)) {
+               n > 0 && n < 100) {
       FLAGS_readwritepercent = n;
     } else if (sscanf(argv[i], "--disable_data_sync=%d%c", &n, &junk) == 1 &&
         (n == 0 || n == 1)) {