usnic: fix some compiler warnings

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

Author: jsquyres

opal/mca/btl/usnic/btl_usnic_cagent.c

@@ -47,7 +47,7 @@ static opal_event_t ipc_event;
 static struct timeval ack_timeout;
 static opal_list_t udp_port_listeners;
 static opal_list_t ipc_listeners;
-static volatile int ipc_accepts = 0;
+static volatile uint32_t ipc_accepts = 0;
 /* JMS The pings_pending and ping_results should probably both be hash
    tables for more efficient lookups */
 static opal_list_t pings_pending;

opal/mca/btl/usnic/btl_usnic_stats.c

@@ -380,7 +380,7 @@ static void setup_mpit_pvars_enum(void)
 
     /* Free the strings (mca_base_var_enum_create() strdup()'ed them
        into private storage, so we don't need them any more) */
-    for (int i = 0; i < mca_btl_usnic_component.num_modules; ++i) {
+    for (i = 0; i < mca_btl_usnic_component.num_modules; ++i) {
         free((char *) devices[i].string);
     }
     free(devices);