kernel: backport fix for non-regular inodes on f2fs

kernel: backport fix for non-regular inodes on f2fs

Upstream commit dda9f4b9ca ("f2fs: fix to skip verifying block address
for non-regular inode").

On 4.14, attempting to perform operations on a non-regular inode
residing on an f2fs filesystem, such rm-ing a device node, would fail
and lead to a warning / call trace in dmesg. This fix was already
applied to other kernels upstream - including 4.19, from which the patch
was taken.

More info at https://bugzilla.kernel.org/show_bug.cgi?id=202495.

Signed-off-by: Matt Merhar <mattmerhar@protonmail.com>