Fix compilation issue for LruCache::operator-- #2127

Job	Run time
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 27s
PSV.Linux.22.04.gcc9.Cpplint	9m 7s
PSV.Linux.22.04.clang	8m 43s
PSV.Linux.22.04.gcc11	8m 1s
PSV.Linux.Android.22.04	6m 7s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 41s
PSV.Linux.22.04.gcc13	8m 50s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 30s
PSV.Win.VC2022	10m 8s
PSV.Clang.Format.Checker	30s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 17s
PSV.Commit.Checker	8s
PSV.MacOS15.Xcode16.ARM64	4m 27s
PSV.iOS.MacOS15.Xcode16.ARM64	8m 36s
PSV.iOS.MacOS14.Xcode15.ARM64	5m 34s
PSV.iOS.MacOS15.Xcode26.ARM64	6m 7s
	1h 34m 13s

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