block migration: propagate return value when bdrv_write() returns < 0
Currently block_load() doesn't check return value of bdrv_write(), and even the destination weren't prepared to execute block migration, it proceeds and guest boots on the target. This patch fix this issue. Signed-off-by: NYoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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