Remove a missed unnecessary nullptr check. #467

Job	Run time
windows (windows-latest, v143, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, YES, ON...	24m 8s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	4m 59s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	5m 0s
windows (windows-latest, v143, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	3m 38s
windows (windows-latest, CLangCL, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, YES,...	27m 54s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, OFF)	6m 37s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, OFF, ON)	7m 7s
windows (windows-latest, CLangCL, x64, Release, OFF, OFF, OFF, OFF, OFF, OFF, NO, ON, ON)	6m 35s
windows (windows-2019, v142, x64, Debug,Release, ON, ON, OpenGL+Vulkan, ON, ON, ON, ON, NO, ON, O...	23m 2s
windows (windows-latest, CLangCL, arm64, Debug,Release, ON, ON, OpenGL, OFF, ON, ON, ON, YES, Vis...	29m 18s
	2h 18m 18s

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