Cast data size to unsigned int #683

Job	Run time
default-linux	8s
min-req	6m 4s
default-linux-with-examples	11s
custom-install-win	1m 55s
preset-support-but-not-enough	9m 27s
root-hint-install-linux	10s
default-win	1m 57s
custom-install-linux	11s
with-wolfssl	57s
with-libressl	1m 23s
with-hunter	2m 57s
no-base64	9s
no-pico	8s
	25m 37s

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