Fix compilation issue for LruCache::operator-- #2128

Job	Run time
PSV.Linux.22.04.gcc13	11m 13s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 28s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 17s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 51s
PSV.Linux.22.04.gcc9.Cpplint	8m 59s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 52s
PSV.Linux.22.04.gcc11	8m 51s
PSV.Linux.22.04.clang	9m 3s
PSV.iOS.MacOS15.Xcode26.ARM64	6m 16s
PSV.iOS.MacOS14.Xcode15.ARM64	9m 23s
PSV.Commit.Checker	8s
PSV.Win.VC2022	9m 58s
PSV.MacOS15.Xcode16.ARM64	6m 2s
PSV.iOS.MacOS15.Xcode16.ARM64	6m 16s
PSV.Linux.Android.22.04	10m 19s
PSV.Clang.Format.Checker	32s
	1h 45m 28s

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