Hello,

As reported yesterday on IRC, since the last round of pulls I am getting
the following warning-treated-as-error:

  CC    block/stream.o
/home/andreas/QEMU/qemu/block/stream.c: In function ‘stream_run’:
/home/andreas/QEMU/qemu/block/stream.c:111:14: error: ‘copy’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
cc1: all warnings being treated as errors
make: *** [block/stream.o] Fehler 1

$ gcc --version
gcc (SUSE Linux) 4.7.2 20130108 [gcc-4_7-branch revision 195012]

However I only got this in 1 of 2 repositories I tried. It turns out
that --enable-debug avoids this build issue.

The stream.c code itself looks okay to me. In the case of ret >= 0, copy
is always assigned, including the goto code path.
Still, could we initialize the copy variable to false or revert whatever
change introduced this build regression? (-Wextra?)

Regards,
Andreas

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