Fix ImageDataUtil.copyPixels crash on Hashlink #1382

Job	Run time
docs	29s
air-samples (4.0.5)	3m 16s
flash-samples	35s
android	25m 39s
air-samples (4.1.5)	3m 24s
html5-samples	1m 35s
air-samples (4.2.5)	3m 2s
air-samples (4.3.1)	3m 14s
linux	14m 38s
ios	16m 48s
macos	16m 6s
windows	13m 56s
package-haxelib	1m 46s
hashlink-samples (windows-latest)	51s
neko-samples (3.4.7, windows-latest)	46s
hashlink-samples (ubuntu-20.04)	18s
hashlinkc-samples (windows-latest)	2m 8s
neko-samples (3.4.7, ubuntu-20.04)	15s
hashlink-samples (macos-13)	44s
hashlinkc-samples (ubuntu-20.04)	1m 31s
neko-samples (3.4.7, macos-13)	41s
hashlinkc-samples (macos-13)	2m 14s
neko-samples (4.2.5, windows-latest)	50s
neko-samples (4.2.5, ubuntu-20.04)	18s
neko-samples (4.2.5, macos-13)	1m 2s
notify	0s
	1h 56m 6s

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