resize.f2fs: get latest free segments

The # of free segments can be changed by defragmentation.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fsck/resize.c b/fsck/resize.c
index 5dc73a8..4813de7 100644
--- a/fsck/resize.c
+++ b/fsck/resize.c
@@ -424,7 +424,7 @@
 	set_cp(overprov_segment_count, get_cp(overprov_segment_count) +
 						get_cp(rsvd_segment_count));
 
-	free_segment_count = get_cp(free_segment_count);
+	free_segment_count = get_free_segments(sbi);
 	new_segment_count = get_newsb(segment_count_main) -
 					get_sb(segment_count_main);