small improvement in x86 unwind debug tracing


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14034 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_stacktrace.c b/coregrind/m_stacktrace.c
index 2345474..be03d8b 100644
--- a/coregrind/m_stacktrace.c
+++ b/coregrind/m_stacktrace.c
@@ -206,8 +206,8 @@
       fp_max -= sizeof(Addr);
 
    if (debug)
-      VG_(printf)("max_n_ips=%d fp_min=0x%lx fp_max_orig=0x%lx, "
-                  "fp_max=0x%lx ip=0x%lx fp=0x%lx\n",
+      VG_(printf)("max_n_ips=%d fp_min=0x%08lx fp_max_orig=0x08%lx, "
+                  "fp_max=0x%08lx ip=0x%08lx fp=0x%08lx\n",
                   max_n_ips, fp_min, fp_max_orig, fp_max,
                   uregs.xip, uregs.xbp);