genfstab: fix duplicate subvol entries
Created by: takeshibaconsuzuki
Options parsed from findmnt may already have the subvol option, so we check if "subvol=" is in $opt before appending onto it.
Fixes FS#65003
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Created by: takeshibaconsuzuki
Options parsed from findmnt may already have the subvol option, so we check if "subvol=" is in $opt before appending onto it.
Fixes FS#65003