/proc/sys: use d_splice_alias() calling conventions to simplify failure exits

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/proc/proc_sysctl.c

@@ -534,13 +534,8 @@ static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
 			goto out;
 	}
 
-	inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
-	if (IS_ERR(inode)) {
-		err = ERR_CAST(inode);
-		goto out;
-	}
-
 	d_set_d_op(dentry, &proc_sys_dentry_operations);
+	inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
 	err = d_splice_alias(inode, dentry);
 
 out:
@@ -698,13 +693,8 @@ static bool proc_sys_fill_cache(struct file *file,
 			return false;
 		if (d_in_lookup(child)) {
 			struct dentry *res;
-			inode = proc_sys_make_inode(dir->d_sb, head, table);
-			if (IS_ERR(inode)) {
-				d_lookup_done(child);
-				dput(child);
-				return false;
-			}
 			d_set_d_op(child, &proc_sys_dentry_operations);
+			inode = proc_sys_make_inode(dir->d_sb, head, table);
 			res = d_splice_alias(inode, child);
 			d_lookup_done(child);
 			if (unlikely(res)) {