scheduler: fix scrutinizer warnings #5161

Job	Run time
libs-build	8m 1s
apps-build	12m 28s
libs-cmake-build	9m 20s
client-armv6-build	4m 17s
client-arm-build	3m 53s
client-arm64-build	4m 48s
client-x86-build	4m 47s
client-x86_64-build	6m 14s
manager-build (assembleRelease)	4m 34s
manager-build (assembleXiaomi_release)	4m 4s
manager-build (assembleArmv6_release)	3m 59s
manager-build (jacocoTestReportDebug)	5m 49s
	1h 12m 14s

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