fix coredump when upgrading PL_sv_yes in a second call to

perl_construct() (from Doug MacEachern)

p4raw-id: //depot/perl@5789

1 files changed, 2 insertions, 2 deletions

diff --git a/perl.c b/perl.c
index f80ee957bf..578fafc3f1 100644
--- a/perl.c
+++ b/perl.c
@@ -683,12 +683,12 @@ perl_destruct(pTHXx)
     SvREFCNT(&PL_sv_yes) = 0;
     sv_clear(&PL_sv_yes);
     SvANY(&PL_sv_yes) = NULL;
-    SvREADONLY_off(&PL_sv_yes);
+    SvFLAGS(&PL_sv_yes) = 0;
 
     SvREFCNT(&PL_sv_no) = 0;
     sv_clear(&PL_sv_no);
     SvANY(&PL_sv_no) = NULL;
-    SvREADONLY_off(&PL_sv_no);
+    SvFLAGS(&PL_sv_no) = 0;
 
     SvREFCNT(&PL_sv_undef) = 0;
     SvREADONLY_off(&PL_sv_undef);