dump.c: avoid compiler warning under -Dmad

this fix was already applied to the non-MAD branch; apply it to
the similar MAD / xml-dump code.

dump.c:2663:57: warning: comparison of constant 85 with expression of type
      'svtype' is always false [-Wtautological-constant-out-of-range-compare]
    else if (sv == (const SV *)0x55555555 || SvTYPE(sv) == 'U') {

1 files changed, 1 insertions, 1 deletions

diff --git a/dump.c b/dump.c
index 13736d711f..4e630ec399 100644
--- a/dump.c
+++ b/dump.c
@@ -2660,7 +2660,7 @@ Perl_sv_xmlpeek(pTHX_ SV *sv)
 	sv_catpv(t, "VOID=\"\"");
 	goto finish;
     }
-    else if (sv == (const SV *)0x55555555 || SvTYPE(sv) == 'U') {
+    else if (sv == (const SV *)0x55555555 || ((char)SvTYPE(sv)) == 'U') {
 	sv_catpv(t, "WILD=\"\"");
 	goto finish;
     }