block: Remove error messages in bdrv_make_zero()
There is only a single caller of bdrv_make_zero(), which is qemu-img convert. If the function fails, we just fall back to a different method of zeroing out blocks on the target image. There is no good reason to print error messages on stderr when the higher level operation will actually succeed. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Acked-by: NEric Blake <eblake@redhat.com>
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