Btrfs: clean up error handling in mount_subvol()
In preparation for new functionality in mount_subvol(), give it ownership of subvol_name and tidy up the error paths. Reviewed-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NOmar Sandoval <osandov@osandov.com> Signed-off-by: NChris Mason <clm@fb.com>
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