Deal with changed interface on fuse_instruction_streams_with_unique_ids

loopy/transform/fusion.py

@@ -210,11 +210,9 @@ def _fuse_two_kernels(knla, knlb):
 
     from pymbolic.imperative.transform import \
             fuse_instruction_streams_with_unique_ids
-    new_instructions = fuse_instruction_streams_with_unique_ids(
+    new_instructions, _ = fuse_instruction_streams_with_unique_ids(
             knla.instructions, knlb.instructions)
 
-    # }}}
-
     # {{{ fuse assumptions
 
     assump_a = knla.assumptions