f2fs: remove unnecessary condition judgment

Remove the unnecessary condition judgment, because
'max_slots' has been initialized to '0' at the beginging
of the function, as following:
if (max_slots)
*max_slots = 0;

Signed-off-by: Yuan Zhong <[e-mail]>
Reviewed-by: Chao Yu <[e-mail]>
Signed-off-by: Jaegeuk Kim <[e-mail]>

fs/f2fs/dir.c

···
 			!memcmp(d->filename[bit_pos], name->name, name->len))
 			goto found;
 
-		if (max_slots && *max_slots >= 0 && max_len > *max_slots) {
+		if (max_slots && max_len > *max_slots) {
 			*max_slots = max_len;
 			max_len = 0;
 		}