sv_vcatpvfn_flags() Balance LC_NUMERIC changes/restores

Prior to this commit, the restore for LC_NUMERIC was getting called even
if there were no corresponding store.  Change so they are balanced; a
future commit will require this.

1 files changed, 4 insertions, 2 deletions

diff --git a/sv.c b/sv.c
index 58d4bf6394..bd655d0d03 100644
--- a/sv.c
+++ b/sv.c
@@ -13329,8 +13329,10 @@ Perl_sv_vcatpvfn_flags(pTHX_ SV *const sv, const char *const pat, const STRLEN p
 
     SvTAINT(sv);
 
-    RESTORE_LC_NUMERIC();   /* Done outside loop, so don't have to save/restore
-                               each iteration. */
+    if (lc_numeric_set) {
+        RESTORE_LC_NUMERIC();   /* Done outside loop, so don't have to
+                                   save/restore each iteration. */
+    }
 }
 
 /* =========================================================================