fs/squashfs: Fix memory leak in sqfs_size_nest()

In case MAX_SYMLINK_NEST is reached while determining the size
on a symlink node, the function returns immediately.
This would not free the resources after the free_strings: label
causing a memory leak.

Set the ret value and just break out of the switch to fix this.

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

fs/squashfs/sqfs.c

@@ -1712,7 +1712,8 @@ static int sqfs_size_nest(const char *filename, loff_t *size)
 	case SQFS_LSYMLINK_TYPE:
 		if (++symlinknest == MAX_SYMLINK_NEST) {
 			*size = 0;
-			return -ELOOP;
+			ret = -ELOOP;
+			break;
 		}
 
 		symlink = (struct squashfs_symlink_inode *)ipos;