fix visualstudio build 9

Author: ndenoyelle

utils/hwloc/hwloc-distrib.c

@@ -325,7 +325,7 @@ int main(int argc, char *argv[])
 	    return EXIT_FAILURE;
 
     // Go to start index.
-    while ( hwloc_distrib_iterator_next(topology, it, &next) && from_index > 0 && next->logical_index != from_index );
+    while ( hwloc_distrib_iterator_next(topology, it, &next) && from_index > 0 && next->logical_index != from_index ) {}
 
     do {
 	    if (logical_index) {