Fix perf script

Author: pablogsal

Tools/inspection/benchmark_external_inspection.py

@@ -174,6 +174,7 @@ def benchmark(unwinder, duration_seconds=10):
     total_work_time = 0.0
     start_time = time.perf_counter()
     end_time = start_time + duration_seconds
+    total_attempts = 0
 
     colors = get_colors(can_colorize())
 
@@ -183,6 +184,7 @@ def benchmark(unwinder, duration_seconds=10):
 
     try:
         while time.perf_counter() < end_time:
+            total_attempts += 1
             work_start = time.perf_counter()
             try:
                 stack_trace = unwinder.get_stack_trace()
@@ -194,7 +196,6 @@ def benchmark(unwinder, duration_seconds=10):
             work_end = time.perf_counter()
             total_work_time += work_end - work_start
 
-            total_attempts = sample_count + fail_count
             if total_attempts % 10000 == 0:
                 avg_work_time_us = (total_work_time / total_attempts) * 1e6
                 work_rate = (
@@ -221,7 +222,6 @@ def benchmark(unwinder, duration_seconds=10):
 
     actual_end_time = time.perf_counter()
     wall_time = actual_end_time - start_time
-    total_attempts = sample_count + fail_count
 
     # Return final statistics
     return {