dir_nlink incorectly handles link count on failed mkdir. (Patch by Andreas.)

b=14974
i=kalpak
i=girish

ldiskfs/kernel_patches/patches/ext3-nlinks-2.6.22-vanilla.patch

@@ -43,15 +43,6 @@ Index: linux-2.6.12/fs/ext3/namei.c
  		return -EMLINK;
  
  retry:
-@@ -1726,7 +1732,7 @@ retry:
- 	inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- 	dir_block = ext3_bread (handle, inode, 0, 1, &err);
- 	if (!dir_block) {
--		drop_nlink(inode); /* is this nlink == 0? */
-+		ext3_dec_count(handle, inode); /* is this nlink == 0? */
- 		ext3_mark_inode_dirty(handle, inode);
- 		iput (inode);
- 		goto out_stop;
 @@ -1758,7 +1764,7 @@ retry:
  		iput (inode);
  		goto out_stop;

ldiskfs/kernel_patches/patches/ext3-nlinks-2.6.7.patch

@@ -30,15 +30,6 @@ Index: linux-2.6.5-7.283/fs/ext3/namei.c
  		return -EMLINK;
  
  retry:
-@@ -1752,7 +1758,7 @@ retry:
- 	inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- 	dir_block = ext3_bread (handle, inode, 0, 1, &err);
- 	if (!dir_block) {
--		inode->i_nlink--; /* is this nlink == 0? */
-+		ext3_dec_count(handle, inode); /* is this nlink == 0? */
- 		ext3_mark_inode_dirty(handle, inode);
- 		iput (inode);
- 		goto out_stop;
 @@ -1784,7 +1790,7 @@ retry:
  		iput (inode);
  		goto out_stop;

ldiskfs/kernel_patches/patches/ext3-nlinks-2.6.9.patch

@@ -30,15 +30,6 @@ Index: linux-2.6.12/fs/ext3/namei.c
  		return -EMLINK;
  
  retry:
-@@ -1726,7 +1732,7 @@ retry:
- 	inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- 	dir_block = ext3_bread (handle, inode, 0, 1, &err);
- 	if (!dir_block) {
--		inode->i_nlink--; /* is this nlink == 0? */
-+		ext3_dec_count(handle, inode); /* is this nlink == 0? */
- 		ext3_mark_inode_dirty(handle, inode);
- 		iput (inode);
- 		goto out_stop;
 @@ -1758,7 +1764,7 @@ retry:
  		iput (inode);
  		goto out_stop;