[Toybox] [PATCH] losetup: fix the race.

[enh]

There's a race between LOOP_CTL_GET_FREE and LOOP_SET_FD. Work around it
by just retrying if we get EBUSY on the LOOP_SET_FD call. This is what
similar code in ChromeOS already does.

Bug: http://b/135716654
---
 toys/other/losetup.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)
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