Default is 1 for the unwind length range, not 0


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15307 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_gdbserver/server.c b/coregrind/m_gdbserver/server.c
index 7a67fd0..485050b 100644
--- a/coregrind/m_gdbserver/server.c
+++ b/coregrind/m_gdbserver/server.c
@@ -459,7 +459,7 @@
       }
       case 10: { /* unwind */
          Addr address;
-         SizeT sz = 0;
+         SizeT sz = 1;
          if (VG_(strtok_get_address_and_size) (&address, 
                                                &sz, &ssaveptr)) {
             VG_(ppUnwindInfo) (address, address + sz - 1);