Cast data size to unsigned int #680

Job	Run time
root-hint-install-linux	11s
default-linux	10s
min-req	6m 7s
with-hunter	2m 58s
no-pico	11s
no-base64	12s
custom-install-linux	8s
preset-support-but-not-enough	9m 40s
default-linux-with-examples	10s
with-wolfssl	56s
default-win	2m 8s
custom-install-win	2m 30s
with-libressl	1m 23s
	26m 44s

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