ext4: use IS_ERR instead of IS_ERR_OR_NULL and set inode null when IS_ERR
1: ext4_iget/ext4_find_extent never returns NULL, use IS_ERR instead of IS_ERR_OR_NULL to fix this. 2: ext4_fc_replay_inode should set the inode to NULL when IS_ERR. and go to call iput properly. Fixes: 8016e29f ("ext4: fast commit recovery path") Signed-off-by: Yi Li <yili@winhong.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20201230033827.3996064-1-yili@winhong.comSigned-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
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