Perl_utf16_to_utf8() should return the correct length when being "understanding"

("be understanding" being a bodge added in 1de9afcdf18cf98b, which will soon go
when I fix the underlying cause of the bugs it works around.)

diff --git a/utf8.c b/utf8.c
index 6907b7e..dc12df8 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -961,7 +961,7 @@ Perl_utf16_to_utf8(pTHX_ U8* p, U8* d, I32 bytelen, I32 *newlen)
     if (bytelen == 1 && p[0] == 0) { /* Be understanding. */
         d[0] = 0;
         *newlen = 1;
-        return d;
+        return d + 1;
     }
 
     if (bytelen & 1)