Fix new warnings shown by Xcode 14.3

[paulb777]

No description provided.

[google-oss-bot]

Coverage Report ¹

Affected Products

• GoogleDataTransport-ios-GoogleDataTransport.framework

  Overall coverage changed from 43.85% (fe7ebfd) to 58.34% (0b1d402) by +14.49%.

  27 individual files with coverage change

  Filename	Base (fe7ebfd)	Merge (0b1d402)	Diff
  GDTCCTCompressionHelper.m	81.63%	0.00%	-81.63%
  GDTCCTNanopbHelpers.m	52.57%	0.00%	-52.57%
  GDTCCTUploader.m	89.54%	20.26%	-69.28%
  GDTCCTUploadOperation.m	91.10%	0.00%	-91.10%
  GDTCORAssert.m	0.00%	88.24%	+88.24%
  GDTCORClock.m	71.26%	86.21%	+14.94%
  GDTCORConsoleLogger.m	18.52%	74.07%	+55.56%
  GDTCORDirectorySizeTracker.m	63.79%	93.10%	+29.31%
  GDTCOREndpoints.m	0.00%	100.00%	+100.00%
  GDTCOREvent+GDTCCTSupport.m	35.42%	0.00%	-35.42%
  GDTCOREvent+GDTMetricsSupport.m	100.00%	0.00%	-100.00%
  GDTCOREvent.m	60.76%	97.47%	+36.71%
  GDTCORFlatFileStorage+Promises.m	0.00%	27.75%	+27.75%
  GDTCORFlatFileStorage.m	13.36%	91.52%	+78.16%
  GDTCORLifecycle.m	40.74%	59.26%	+18.52%
  GDTCORLogSourceMetrics.m	52.17%	93.91%	+41.74%
  GDTCORMetrics+GDTCCTSupport.m	95.24%	0.00%	-95.24%
  GDTCORMetrics.m	47.27%	40.00%	-7.27%
  GDTCORMetricsController.m	16.28%	94.77%	+78.49%
  GDTCORMetricsMetadata.m	0.00%	100.00%	+100.00%
  GDTCORPlatform.m	51.92%	65.11%	+13.19%
  GDTCORRegistrar.m	76.72%	75.66%	-1.06%
  GDTCORStorageMetadata.m	0.00%	100.00%	+100.00%
  GDTCORTransformer.m	0.00%	90.91%	+90.91%
  GDTCORTransport.m	0.00%	85.71%	+85.71%
  GDTCORUploadBatch.m	100.00%	0.00%	-100.00%
  GDTCORUploadCoordinator.m	59.74%	79.87%	+20.13%

Test Logs

• Base (fe7ebfd): https://github.com/google/GoogleDataTransport/actions/runs/4470840059
• Merge (0b1d402): https://github.com/google/GoogleDataTransport/actions/runs/4598005325

1. https://storage.googleapis.com/firebase-sdk-metric-reports/FYWD5VtJE1.html