nvme/streams: avoid allocating too large a buffer #889

Job	Run time
build (linux-gcc)	14m 13s
build (linux-clang)	11m 46s
build (macos)	12m 46s
build (linux-i686-gcc)	13m 10s
build (android)	36s
build (windows-cygwin-64)	18m 20s
build (windows-cygwin-32)	16m 53s
build (windows-msys2-64)	13m 37s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	36s
	1h 41m 57s

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