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/net/unix/af_unix.c b/net/unix/af_unix.c
index dd419d2..d8c04a6 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -850,7 +850,7 @@
 		 * Get the parent directory, calculate the hash for last
 		 * component.
 		 */
-		err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd);
+		err = kern_path_parent(sunaddr->sun_path, &nd);
 		if (err)
 			goto out_mknod_parent;