block: make qiov_is_aligned() public
The qiov_is_aligned() function checks whether a QEMUIOVector meets a BlockDriverState's alignment requirements. This is needed by virtio-blk-data-plane so: 1. Move the function from block/raw-posix.c to block/block.c. 2. Make it public in block/block.h. 3. Rename to bdrv_qiov_is_aligned(). 4. Change return type from int to bool. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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