filesystems: add set_nlink()

Replace remaining direct i_nlink updates with a new set_nlink()
updater function.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 1fbc7de..70e79d0 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -363,7 +363,7 @@
 			break;
 		case SIG('P', 'X'):
 			inode->i_mode = isonum_733(rr->u.PX.mode);
-			inode->i_nlink = isonum_733(rr->u.PX.n_links);
+			set_nlink(inode, isonum_733(rr->u.PX.n_links));
 			inode->i_uid = isonum_733(rr->u.PX.uid);
 			inode->i_gid = isonum_733(rr->u.PX.gid);
 			break;
@@ -496,7 +496,7 @@
 				goto out;
 			}
 			inode->i_mode = reloc->i_mode;
-			inode->i_nlink = reloc->i_nlink;
+			set_nlink(inode, reloc->i_nlink);
 			inode->i_uid = reloc->i_uid;
 			inode->i_gid = reloc->i_gid;
 			inode->i_rdev = reloc->i_rdev;