quota: clean up quota active checks
The various quota operations check for any quota beeing active on a superblock, and the inode not having the noquota flag. Merge these two checks into a dquot_active check and move that into dquot.c as that's the only place where it's needed. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJan Kara <jack@suse.cz>
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