nwtc lib: SetErrStat ref'd incorrectly in VTK #3005

Job	Run time
build-all-debug	7m 42s
build-all-debug-single	3m 47s
build-postlib-release	12m 37s
build-drivers-release	4m 59s
build-test-uadriver-debug	1m 52s
rtest-module-drivers	2m 45s
rtest-modules-debug	6m 24s
build-fastfarm-release	13m 8s
build-interfaces-release	4m 16s
build-openfast-release	4m 31s
rtest-interfaces	3m 22s
rtest-OF-5MW_Land_AeroMap	1m 20s
rtest-OF	7m 11s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 31s
rtest-OF-simulink	11m 11s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 28s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	1m 0s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	1m 53s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 0s
rtest-OF-linearization	3m 44s
rtest-FF	1m 58s
	1h 42m 39s

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