Commit patch from upstream hwloc: r3482. Fixes some compiler

warnings. 

This commit was SVN r24641.

The following SVN revision numbers were found above:
  r3482 --> open-mpi/ompi@2435be8d49

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

@@ -219,7 +219,7 @@ static void look_proc(struct procinfo *infos, unsigned highest_cpuid, unsigned h
   }
 
   if (cpuid_type == intel && highest_cpuid >= 0x0b) {
-    unsigned level, apic_nextshift, apic_number, apic_type, apic_id, apic_shift = 0, id;
+    unsigned level, apic_nextshift, apic_number, apic_type, apic_id = 0, apic_shift = 0, id;
     for (level = 0; ; level++) {
       ecx = level;
       eax = 0x0b;
@@ -270,7 +270,8 @@ static void look_proc(struct procinfo *infos, unsigned highest_cpuid, unsigned h
 static void summarize(hwloc_topology_t topology, struct procinfo *infos, unsigned nbprocs)
 {
   hwloc_bitmap_t complete_cpuset = hwloc_bitmap_alloc();
-  unsigned i, j, l, one, level;
+  unsigned i, j, l, level;
+  int one = -1;
 
   for (i = 0; i < nbprocs; i++)
     if (infos[i].present) {
@@ -278,6 +279,9 @@ static void summarize(hwloc_topology_t topology, struct procinfo *infos, unsigne
       one = i;
     }
 
+  if (one == -1)
+    return;
+
   /* Look for sockets */
   {
     hwloc_bitmap_t sockets_cpuset = hwloc_bitmap_dup(complete_cpuset);