Revert "Fix off-by-one: avoid allocating an extra context"

This reverts commit 395b8e2d02eadc9b0639534410c39c530bc8a33d.
The fencepost error is coming from inside the programmer!

1 files changed, 2 insertions, 2 deletions

diff --git a/scope.c b/scope.c
index 2d9e3834f2..92e952360d 100644
--- a/scope.c
+++ b/scope.c
@@ -77,10 +77,10 @@ Perl_cxinc(pTHX)
     dVAR;
     const IV old_max = cxstack_max;
     cxstack_max = GROW(cxstack_max);
-    Renew(cxstack, cxstack_max, PERL_CONTEXT);
+    Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);	/* XXX should fix CXINC macro */
     /* Without any kind of initialising deep enough recursion
      * will end up reading uninitialised PERL_CONTEXTs. */
-    PoisonNew(cxstack + old_max, cxstack_max - old_max, PERL_CONTEXT);
+    PoisonNew(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
     return cxstack_ix + 1;
 }