block: Reuse success path from bdrv_open()
The fail and success paths of bdrv_file_open() may be further shortened by reusing code already existent in bdrv_open(). This includes bdrv_file_open() not taking the reference to options which allows the removal of QDECREF(options) in that function. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NBenoit Canet <benoit@irqsave.net> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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