regcomp.c: Slight simplification

Rather than know how far we have advanced in parsing when we have to
back up, use the already-existing checkpoint position.  This results in
slightly more maintainable code that a future commit will take advantage
of.

1 files changed, 1 insertions, 1 deletions

diff --git a/regcomp.c b/regcomp.c
index 64cb5e9628..6509129737 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -14432,7 +14432,7 @@ S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
                         if ( !isDIGIT(p[1]) || S_backref_value(p, RExC_end) < RExC_npar)
                         {  /* Not to be treated as an octal constant, go
                                    find backref */
-                            --p;
+                            p = oldp;
                             goto loopdone;
                         }
                         /* FALLTHROUGH */