validator: fix potential infinite loop #4849

Job	Run time
libs-build	6m 4s
apps-build	9m 1s
client-armv6-build	2m 43s
libs-cmake-build	7m 10s
client-arm-build	3m 37s
client-arm64-build	3m 21s
client-x86-build	3m 4s
client-x86_64-build	3m 0s
manager-build (assembleRelease)	3m 54s
manager-build (assembleXiaomi_release)	4m 1s
manager-build (assembleArmv6_release)	3m 52s
manager-build (jacocoTestReportDebug)	5m 39s
	55m 26s

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