turn user_{path_at,path,lpath,path_dir}() into static inlines

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 1a117c0..2dad0ea 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2299,13 +2299,7 @@
 	return filename_lookup(dfd, getname_flags(name, flags, empty),
 			       flags, path, NULL);
 }
-
-int user_path_at(int dfd, const char __user *name, unsigned flags,
-		 struct path *path)
-{
-	return user_path_at_empty(dfd, name, flags, path, NULL);
-}
-EXPORT_SYMBOL(user_path_at);
+EXPORT_SYMBOL(user_path_at_empty);
 
 /*
  * NB: most callers don't do anything directly with the reference to the