fixes move analyser; refs #11257

tests/destructor/tconsume_twice.nim

@@ -0,0 +1,12 @@
+discard """
+  cmd: "nim c --newruntime $file"
+  errormsg: "sink parameter `a` is already consumed at tconsume_twice.nim(8, 6)"
+  line: 10
+"""
+
+proc consumeTwice(a: owned proc()): owned proc() =
+  if a == nil:
+    return
+  return a
+
+assert consumeTwice(proc() = discard) != nil