db_bench: fix hang on IO error (#5300)

Summary:
db_bench will wait indefinitely if there's background error. Fix by pass `abs_time_us` to cond var.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5300

Differential Revision: D15319945

Pulled By: miasantreble

fbshipit-source-id: 0034fb7f6ec7c3303c4ccf26e54c20fbdac8ab44

tools/db_bench_tool.cc

@@ -2102,10 +2102,10 @@ class Benchmark {
       cv_.SignalAll();
     }
 
-    bool WaitForRecovery(uint64_t /*abs_time_us*/) {
+    bool WaitForRecovery(uint64_t abs_time_us) {
       InstrumentedMutexLock l(&mutex_);
       if (!recovery_complete_) {
-        cv_.Wait(/*abs_time_us*/);
+        cv_.TimedWait(abs_time_us);
       }
       if (recovery_complete_) {
         recovery_complete_ = false;