tinystdio: Fix missing error report in underlying close function of fclose #85

Job	Run time
cache-maker	12s
minsize-zephyr (./.github/do-zephyr)	35m 16s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	33m 53s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	34m 20s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	18m 53s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	18m 23s
release-zephyr (./.github/do-zephyr)	35m 59s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	42m 57s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 7s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	19m 57s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	19m 7s
	4h 54m 4s

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