mwifiex: fix powerpc64-linux- compilation warnings

These warnings can be detected by using powerpc64-linux toolchain
(gcc-4.6.3-nolibc).

  CC [M]  drivers/net/wireless/mwifiex/sta_event.o
drivers/net/wireless/mwifiex/sta_event.c: In function 'mwifiex_process_sta_event':
drivers/net/wireless/mwifiex/sta_event.c:388:4: warning: comparison of distinct pointer types lacks a cast [enabled by default]
  CC [M]  drivers/net/wireless/mwifiex/uap_event.o
drivers/net/wireless/mwifiex/uap_event.c: In function 'mwifiex_process_uap_event':
drivers/net/wireless/mwifiex/uap_event.c:258:11: warning: comparison of distinct pointer types lacks a cast [enabled by default]

Use min_t() instead of min() to fix the warnings.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/sta_event.c b/drivers/net/wireless/mwifiex/sta_event.c
index 2aad148..4758d30 100644
--- a/drivers/net/wireless/mwifiex/sta_event.c
+++ b/drivers/net/wireless/mwifiex/sta_event.c
@@ -186,6 +186,7 @@
 	struct mwifiex_adapter *adapter = priv->adapter;
 	int ret = 0;
 	u32 eventcause = adapter->event_cause;
+	u16 ctrl;
 
 	switch (eventcause) {
 	case EVENT_DUMMY_HOST_WAKEUP_SIGNAL:
@@ -382,11 +383,11 @@
 					      adapter->event_body);
 		break;
 	case EVENT_AMSDU_AGGR_CTRL:
-		dev_dbg(adapter->dev, "event:  AMSDU_AGGR_CTRL %d\n",
-			*(u16 *) adapter->event_body);
+		ctrl = le16_to_cpu(*(__le16 *)adapter->event_body);
+		dev_dbg(adapter->dev, "event: AMSDU_AGGR_CTRL %d\n", ctrl);
+
 		adapter->tx_buf_size =
-			min(adapter->curr_tx_buf_size,
-			    le16_to_cpu(*(__le16 *) adapter->event_body));
+				min_t(u16, adapter->curr_tx_buf_size, ctrl);
 		dev_dbg(adapter->dev, "event: tx_buf_size %d\n",
 			adapter->tx_buf_size);
 		break;