block: Don't copy backing file name on error
bdrv_open_backing_file() tries to copy the backing file name using pstrcpy directly after calling bdrv_open() to open the backing file without checking whether that was actually successful. If it was not, ps->backing_hd->file will probably be NULL and qemu will crash. Fix this by moving pstrcpy after checking whether bdrv_open() succeeded. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NBenoit Canet <benoit@irqsave.net> Reviewed-by: Amos Kong <kongjianjun@gmail.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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