correct compile issue

This commit was SVN r9060.

orte/mca/soh/bproc/soh_bproc.c

@@ -141,6 +141,7 @@ static void update_registry(bit_set changes, struct bproc_node_info_t *ni)
     struct passwd *pwd;
     struct group *grp;
     orte_gpr_value_t *value;
+    int rc;
 
     cnt = num_bits(changes);