tinystdio:fixing hexadecimal string conversion #69

Job	Run time
cache-maker	11s
release-zephyr (./.github/do-zephyr)	36m 39s
minsize-zephyr (./.github/do-zephyr)	34m 58s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	34m 53s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	34m 29s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 25s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	34m 48s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	20m 27s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	19m 9s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	18m 57s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	10m 30s
	4h 40m 26s

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