Fixed the calib size bug (#1178)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Bug Fixes**
* Fixed quantization configuration calibration batch counting to
properly account for partial final batches during the calibration
process.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Jingyu Xin <jingyux@nvidia.com>

Author: jingyu-ml

examples/diffusers/quantization/quantize_config.py

@@ -12,6 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import math
 from dataclasses import dataclass, field
 from enum import Enum
 from pathlib import Path
@@ -110,7 +111,7 @@ def validate(self) -> None:
     @property
     def num_batches(self) -> int:
         """Calculate number of calibration batches."""
-        return self.calib_size // self.batch_size
+        return math.ceil(self.calib_size / self.batch_size)
 
 
 @dataclass