UPSTREAM: f2fs: fix to do sanity check in update_sit_entry

If GET_SEGNO return NULL_SEGNO for some unecpected case,
update_sit_entry will access invalid memory address,
cause system crash. It is better to do sanity check about
GET_SEGNO just like update_segment_mtime & locate_dirty_segment.

Also remove some redundant judgment code.

Bug: 365944734
Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit fb7f3bdc)
Change-Id: Ie980a9b2512b00da4eeeff91bf40494a68aa6084
(cherry picked from commit 7c61d7e3)