Squashfs: use define instead of constant

Its better to use defined name instead of constant
Signed-off-by: Ajeet Yadav <ajeet.yadav.77@gmail.com>
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>

fs/squashfs/dir.c

@@ -173,8 +173,7 @@ static int squashfs_readdir(struct file *file, void *dirent, filldir_t filldir)
 
 		dir_count = le32_to_cpu(dirh.count) + 1;
 
-		/* dir_count should never be larger than 256 */
-		if (dir_count > 256)
+		if (dir_count > SQUASHFS_DIR_COUNT)
 			goto failed_read;
 
 		while (dir_count--) {

fs/squashfs/namei.c

@@ -177,8 +177,7 @@ static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry,
 
 		dir_count = le32_to_cpu(dirh.count) + 1;
 
-		/* dir_count should never be larger than 256 */
-		if (dir_count > 256)
+		if (dir_count > SQUASHFS_DIR_COUNT)
 			goto data_error;
 
 		while (dir_count--) {

fs/squashfs/squashfs_fs.h

@@ -52,6 +52,9 @@
 /* Max length of filename (not 255) */
 #define SQUASHFS_NAME_LEN		256
 
+/* Max value for directory header count*/
+#define SQUASHFS_DIR_COUNT		256
+
 #define SQUASHFS_INVALID_FRAG		(0xffffffffU)
 #define SQUASHFS_INVALID_XATTR		(0xffffffffU)
 #define SQUASHFS_INVALID_BLK		(-1LL)