[PATCH 4/6] procfs: switch ERR_PTR to ERR_OR_0_PTR when "error" might be 0

[Marcin Slusarz <marcin.slusarz@gmail.com>]

proc_pid_follow_link and proc_self_follow_link call ERR_PTR with 0 argument
(invalid errno) in most of situtations.
Replace ERR_PTR calls with ERR_OR_0_PTR which accepts 0 argument.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 fs/proc/base.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 808cbdc..ebbb8e6 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1292,7 +1292,7 @@ static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
 	error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
 	nd->last_type = LAST_BIND;
 out:
-	return ERR_PTR(error);
+	return ERR_OR_0_PTR(error);
 }
 
 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
@@ -2228,7 +2228,7 @@ static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
 	if (!tgid)
 		return ERR_PTR(-ENOENT);
 	sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
-	return ERR_PTR(vfs_follow_link(nd,tmp));
+	return ERR_OR_0_PTR(vfs_follow_link(nd,tmp));
 }
 
 static const struct inode_operations proc_self_inode_operations = {
-- 
1.5.4.5