pp.c: Can grow scalar by less

The max expansion when a Latin1 character is folded and converted to
UTF-8 is '2' bytes per input byte, not the more general case.

1 files changed, 3 insertions, 1 deletions

diff --git a/pp.c b/pp.c
index 1dc04608e4..29ed4c672e 100644
--- a/pp.c
+++ b/pp.c
@@ -4218,7 +4218,9 @@ PP(pp_fc)
                     SvCUR_set(dest, len);
                     len = sv_utf8_upgrade_flags_grow(dest,
                                                 SV_GMAGIC|SV_FORCE_UTF8_UPGRADE,
-                                                (send -s) * UTF8_MAX_FOLD_CHAR_EXPAND + 1);
+						/* The max expansion for latin1
+						 * chars is 1 byte becomes 2 */
+                                                (send -s) * 2 + 1);
                     d = (U8*)SvPVX(dest) + len;
 
                     CAT_UNI_TO_UTF8_TWO_BYTE(d, GREEK_SMALL_LETTER_MU);