Manually add hwloc v1.1 branch r3418 commit (went in after v1.1.2

released): 

backport hwloc r 3416 from trunk: Add cache info entry _after_ checking
that we need one, thanks Andriy Gapon for the fix

This commit was SVN r24612.

The following SVN revision numbers were found above:
  r3418 --> open-mpi/ompi@9972663a12

opal/mca/common/hwloc/hwloc/src/topology-x86.c

@@ -1,6 +1,6 @@
 /*
  * Copyright © 2010-2011 INRIA.  All rights reserved.
- * Copyright © 2010 Université Bordeaux 1
+ * Copyright © 2010-2011 Université Bordeaux 1
  * Copyright © 2010-2011 Cisco Systems, Inc.  All rights reserved.
  * See COPYING in top-level directory.
  *
@@ -59,10 +59,6 @@ static void fill_amd_cache(struct procinfo *infos, unsigned level, unsigned cpui
   unsigned cachenum;
   unsigned size = 0;
 
-  cachenum = infos->numcaches++;
-  infos->cache = realloc(infos->cache, infos->numcaches*sizeof(*infos->cache));
-  cache = &infos->cache[cachenum];
-
   if (level == 1)
     size = ((cpuid >> 24)) << 10;
   else if (level == 2)
@@ -72,6 +68,10 @@ static void fill_amd_cache(struct procinfo *infos, unsigned level, unsigned cpui
   if (!size)
     return;
 
+  cachenum = infos->numcaches++;
+  infos->cache = realloc(infos->cache, infos->numcaches*sizeof(*infos->cache));
+  cache = &infos->cache[cachenum];
+
   cache->type = 1;
   cache->level = level;
   if (level <= 2)