tinystdio: Fix missing error report in underlying close function of fclose #82

Job	Run time
cache-maker	5s
minsize-zephyr (./.github/do-zephyr)	35m 36s
release-zephyr (./.github/do-zephyr)	35m 45s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	35m 6s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	34m 56s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	36m 4s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 34s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	20m 24s
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...	10m 2s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	10m 42s
	4h 33m 23s

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