utf8.c: fix leak

Commit 8946fcd98c63bdc848cec00a1c72aaf232d932a1 failed to free a scalar
it created.  I meant to do so, but in the end, forgot.

1 files changed, 2 insertions, 0 deletions

diff --git a/utf8.c b/utf8.c
index b06356579e..b3dd09d6b8 100644
--- a/utf8.c
+++ b/utf8.c
@@ -5332,6 +5332,8 @@ Perl__swash_inversion_hash(pTHX)
 	}
     }
 
+    SvREFCNT_dec(swash);
+
     return ret;
 }