Fix a couple of 'unused variable' warnings, and one return value warning.

{{{
base/paffinity_base_service.c: In function ‘opal_paffinity_base_cset2mapstr’:
base/paffinity_base_service.c:623: warning: unused variable ‘range_last’
base/paffinity_base_service.c:623: warning: unused variable ‘range_first’
base/paffinity_base_service.c:622: warning: unused variable ‘count’
base/paffinity_base_service.c:622: warning: unused variable ‘m’
}}}

{{{
connect/btl_openib_connect_oob.c: In function ‘init_ud_qp’:
connect/btl_openib_connect_oob.c:1111: warning: control reaches end of non-void function
connect/btl_openib_connect_oob.c: In function ‘init_device’:
connect/btl_openib_connect_oob.c:1235: warning: unused variable ‘i’
connect/btl_openib_connect_oob.c: In function ‘get_pathrecord_sl’:
connect/btl_openib_connect_oob.c:1323: warning: unused variable ‘i’
}}}

This commit was SVN r24196.

ompi/mca/btl/openib/connect/btl_openib_connect_oob.c

@@ -1108,6 +1108,7 @@ static int init_ud_qp(struct ibv_context *context_arg,
         return OMPI_ERROR;
     }
 
+    return OMPI_SUCCESS;
 }
 static void init_sa_mad(struct mca_btl_openib_sa_qp_cache *cache,
                         struct ib_mad_sa *sag,
@@ -1232,7 +1233,7 @@ static int init_device(struct ibv_context *context_arg,
     struct ibv_ah_attr aattr;
     struct ibv_port_attr pattr;
     struct ibv_recv_wr *brwr;
-    int i, rc;
+    int rc;
 
     cache->context = ibv_open_device(context_arg->device);
     if (NULL == cache->context) {
@@ -1320,7 +1321,7 @@ static int get_pathrecord_sl(struct ibv_context *context_arg,
     struct ibv_sge ssge;
     struct mca_btl_openib_sa_qp_cache *cache;
     long page_size = sysconf(_SC_PAGESIZE);
-    int i, rc;
+    int rc;
 
     /* search for a cached item */
     for (cache = sa_qp_cache; cache; cache = cache->next) {

opal/mca/paffinity/base/paffinity_base_service.c

@@ -619,8 +619,7 @@ int opal_paffinity_base_cset2str(char *str, int len,
 int opal_paffinity_base_cset2mapstr(char *str, int len, 
 				    opal_paffinity_base_cpu_set_t *cset)
 {
-    int ret, i, j, k, m, num_sockets, num_cores, flag, count, 
-        range_first=0, range_last;
+    int ret, i, j, k, num_sockets, num_cores, flag;
     char tmp[BUFSIZ];
     const int stmp = sizeof(tmp) - 1;