avoid sort assert failure after compile fail

RT #130617

in rpeep(), there's an assert that the optree is sane for the sort's
codeblock. After compile errors, it isn;t necessary sane, so skip the
assert in that case.

I've also changed a kLISTOP->op_next into the equivalent but less
obfuscated kid->op_next.

1 files changed, 3 insertions, 2 deletions

diff --git a/op.c b/op.c
index d2fd198ddf..0ba58c7ac2 100644
--- a/op.c
+++ b/op.c
@@ -14446,8 +14446,9 @@ Perl_rpeep(pTHX_ OP *o)
                       && (  kid->op_targ == OP_NEXTSTATE
                          || kid->op_targ == OP_DBSTATE  ))
                     || kid->op_type == OP_STUB
-                    || kid->op_type == OP_ENTER);
-                nullop->op_next = kLISTOP->op_next;
+                    || kid->op_type == OP_ENTER
+                    || (PL_parser && PL_parser->error_count));
+                nullop->op_next = kid->op_next;
                 DEFER(nullop->op_next);
 	    }