kill path_lookup()

all remaining callers pass LOOKUP_PARENT to it, so
flags argument can die; renamed to kern_path_parent()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 20b9fe6..e683869 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -359,7 +359,7 @@
 	struct dentry *d;
 	int err;
 
-	err = path_lookup(watch->path, LOOKUP_PARENT, &nd);
+	err = kern_path_parent(watch->path, &nd);
 	if (err)
 		return err;