iomap: invert the polarity of IOMAP_DIO_INLINE_COMP

iomap: invert the polarity of IOMAP_DIO_INLINE_COMP

Replace IOMAP_DIO_INLINE_COMP with a flag to indicate that the
completion should be offloaded.  This removes a tiny bit of boilerplate
code, but more importantly just makes the code easier to follow as this
new flag gets set most of the time and only cleared in one place, while
it was the inverse for the old version.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20251113170633.1453259-6-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>