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qemu-img: always goto out in img_snapshot() error paths
The out label has the qemu_progress_end() and other cleanup calls. Always goto out in error paths so the cleanup happens. These error paths now return 1 instead of -1. Note that bdrv_unref(NULL) is safe. We just need to initialize bs to NULL at the top of the function. We can now remove the obsolete bs_old_backing = NULL and bs_new_backing = NULL for safe mode. Originally it was necessary in commit 3e85c6f ("qemu-img rebase") but became useless in commit c2abcce ("qemu-img: avoid calling exit(1) to release resources properly") because the variables are already initialized during declaration. Reported-by: John Snow <jsnow@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
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