zstream_redup ‘stream_offset’ may be used uninitialized in this function

[IslandLife]

System information

Type	Version/Name
Distribution Name	Ubuntu
Distribution Version	focal
Linux Kernel	5.4.0-26-generic
Architecture	amd64
ZFS Version	0.8.0-734_g70e5ad31f
SPL Version

Describe the problem you're observing

ZFS compiles with very few warnings. However this one appears recently.

Describe how to reproduce the problem

compile

Include any warning/errors/backtraces from the system logs

Example:

Making all in zstream
  CC       zstream.o
  CC       zstream_dump.o
  CC       zstream_redup.o
zstream_redup.c: In function ‘zfs_redup_stream.constprop’:
zstream_redup.c:316:4: warning: ‘stream_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  316 |    spread(infd, drr, sizeof (*drr), stream_offset);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  CCLD     zstream
Making all in zstreamdump
Making all in ztest

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