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Silence useless LOOP_GET_STATUS64 warnings
When vold starts up, there are lots of warnings like:
W vold : Failed to LOOP_GET_STATUS64 /dev/block/loop30: No such device or address
W vold : Failed to LOOP_GET_STATUS64 /dev/block/loop29: No such device or address
W vold : Failed to LOOP_GET_STATUS64 /dev/block/loop28: No such device or address
vold is iterating through all loop devices and unbinding the file from
any vold-managed ones.
It's expected that not all loop devices have a file bound to them,
however. On these, LOOP_GET_STATUS64 fails with ENXIO.
Don't print a warning in such cases.
Change-Id: I91755259dc2c09b1869627259d1e59d5edd6f145