More ext2fs header cleanups:

- Set MAXMNTLEN nearer to where it is used.
- Move EXT2_LINK_MAX to ext2_dir.h .

MFC after:	3 days

sys/fs/ext2fs/ext2_dir.h

@@ -53,6 +53,12 @@ struct	ext2fs_direct_2 {
 	uint8_t e2d_type;		/* file type */
 	char e2d_name[EXT2FS_MAXNAMLEN];/* name with length<=EXT2FS_MAXNAMLEN */
 };
+
+/*
+ * Maximal count of links to a file
+ */
+#define EXT2_LINK_MAX	32000
+
 /*
  * Ext2 directory file types.  Only the low 3 bits are used.  The
  * other bits are reserved for now.

sys/fs/ext2fs/ext2fs.h

@@ -39,18 +39,6 @@
 
 #include <sys/types.h>
 
-/*
- * Maximal count of links to a file
- */
-#define EXT2_LINK_MAX		32000
-
-/*
- * The path name on which the file system is mounted is maintained
- * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
- * the super block for this name.
- */
-#define MAXMNTLEN 512
-
 /*
  * Super block for an ext2fs file system.
  */
@@ -121,6 +109,12 @@ struct ext2fs {
 	uint32_t  reserved2[162];	/* Padding to the end of the block */	
 };
 
+/*
+ * The path name on which the file system is mounted is maintained
+ * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
+ * the super block for this name.
+ */
+#define MAXMNTLEN 512
 
 /*
  * In-Memory Superblock