lib: fix typo in createBlobReaderStream #257

Job	Run time
Build slim tarball	1m 39s
aarch64-linux: with shared libraries	29m 14s
x86_64-darwin: with shared libraries	57m 1s
aarch64-darwin: with shared libraries	32m 8s
x86_64-linux: with shared libraries	34m 35s
	2h 34m 37s

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