S_hfreeentries: keep OOK off unless adding something to aux

This small optimisation allows hv_undef to skips its if(SvOOK()) block
and all the checks inside it much of the time.

1 files changed, 1 insertions, 1 deletions

diff --git a/hv.c b/hv.c
index 376b5dcf49..fb9dfec1be 100644
--- a/hv.c
+++ b/hv.c
@@ -1803,7 +1803,7 @@ S_hfreeentries(pTHX_ HV *hv)
 
     HvARRAY(hv) = orig_array;
 
-    if (has_aux)
+    if (has_aux && current_aux)
 	SvFLAGS(hv) |= SVf_OOK;
     else
 	SvFLAGS(hv) &=~SVf_OOK;