f2fs: remove unneeded initialization of nr_dirty in dirty_seglist_info

Since, the memory for the object of dirty_seglist_info is allocated
using kzalloc - which returns zeroed out memory. So, there is no need
to initialize the nr_dirty values with zeroes.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/segment.c

@@ -1575,7 +1575,6 @@ static int build_dirty_segmap(struct f2fs_sb_info *sbi)
 
 	for (i = 0; i < NR_DIRTY_TYPE; i++) {
 		dirty_i->dirty_segmap[i] = kzalloc(bitmap_size, GFP_KERNEL);
-		dirty_i->nr_dirty[i] = 0;
 		if (!dirty_i->dirty_segmap[i])
 			return -ENOMEM;
 	}