[Libguestfs] [PACTH v2] customize: fix --upload to FAT partition (RHBZ#1196101)

[Richard W.M. Jones]

What was wrong with detecting ENOTSUP and turning it into a warning
then?

For reference see:

https://github.com/libguestfs/libguestfs/blob/master/sparsify/in_place.ml#L38-L46

Rich.

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