FROMGIT: f2fs: fix the wrong condition to determine atomic context

Should use !in_task for irq context.

Bug: 281085599
Cc: stable@vger.kernel.org
Fixes: 1aa161e4 ("f2fs: fix scheduling while atomic in decompression path")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit f063fa43995667dbdf5b46406774a0ad58310dae
 https://git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
Change-Id: I5ce9286cc380309ee5e294f54ec357a4bfa47d6f