tinystdio: Fix missing error report in underlying close function of fclose #84

Job	Run time
cache-maker	9s
release-zephyr (./.github/do-zephyr)	36m 44s
minsize-zephyr (./.github/do-zephyr)	34m 42s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	34m 51s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	33m 49s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	34m 58s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	33m 53s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	20m 7s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	17m 35s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	10m 17s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	10m 45s
	4h 27m 50s

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