iget: stop AFFS from using iget() and read_inode()

Stop the AFFS filesystem from using iget() and read_inode().  Replace
affs_read_inode() with affs_iget(), and call that instead of iget().
affs_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

affs_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/affs/amigaffs.c b/fs/affs/amigaffs.c
index f4de4b9..8055730 100644
--- a/fs/affs/amigaffs.c
+++ b/fs/affs/amigaffs.c
@@ -170,9 +170,11 @@
 		if (!link_bh)
 			goto done;
 
-		dir = iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
-		if (!dir)
+		dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
+		if (IS_ERR(dir)) {
+			retval = PTR_ERR(dir);
 			goto done;
+		}
 
 		affs_lock_dir(dir);
 		affs_fix_dcache(dentry, link_ino);