command buffers: correctly handle Flush(num_entries)

gpu/command_buffer/service/command_buffer_service.cc

Index: gpu/command_buffer/service/command_buffer_service.cc
diff --git a/gpu/command_buffer/service/command_buffer_service.cc b/gpu/command_buffer/service/command_buffer_service.cc
index e91a386bd5f479b2e64ad70ba312711230b24e0d..ec9facb23331dd123e3ee2b831af4ed4e288293d 100644
--- a/gpu/command_buffer/service/command_buffer_service.cc
+++ b/gpu/command_buffer/service/command_buffer_service.cc
@@ -87,7 +87,7 @@ void CommandBufferService::WaitForGetOffsetInRange(int32_t start, int32_t end) {
 }
 
 void CommandBufferService::Flush(int32_t put_offset) {
-  if (put_offset < 0 || put_offset > num_entries_) {
+  if (put_offset < 0 || put_offset >= num_entries_) {
     error_ = gpu::error::kOutOfBounds;
     return;
   }