ath9k: fix an uninitialized variable warning

SVN-Revision: 32734

package/mac80211/patches/576-ath9k_rx_dma_stop_check.patch

@@ -1,15 +1,28 @@
 --- a/drivers/net/wireless/ath/ath9k/mac.c
 +++ b/drivers/net/wireless/ath/ath9k/mac.c
-@@ -718,6 +718,12 @@ bool ath9k_hw_stopdmarecv(struct ath_hw 
- 		udelay(AH_TIME_QUANTUM);
+@@ -689,7 +689,7 @@ bool ath9k_hw_stopdmarecv(struct ath_hw 
+ {
+ #define AH_RX_STOP_DMA_TIMEOUT 10000   /* usec */
+ 	struct ath_common *common = ath9k_hw_common(ah);
+-	u32 mac_status, last_mac_status = 0;
++	u32 mac_status = 0, last_mac_status = 0;
+ 	int i;
+ 
+ 	/* Enable access to the DMA observation bus */
+@@ -719,6 +719,16 @@ bool ath9k_hw_stopdmarecv(struct ath_hw 
  	}
  
-+	if (!AR_SREV_9300_20_OR_LATER(ah) && (mac_status & 0x700) == 0) {
-+		/* DMA is idle but the MAC is still stuck processing events */
-+		*reset = true;
-+		return true;
-+	}
-+
  	if (i == 0) {
++		if (!AR_SREV_9300_20_OR_LATER(ah) &&
++		    (mac_status & 0x700) == 0) {
++			/*
++			 * DMA is idle but the MAC is still stuck
++			 * processing events
++			 */
++			*reset = true;
++			return true;
++		}
++
  		ath_err(common,
  			"DMA failed to stop in %d ms AR_CR=0x%08x AR_DIAG_SW=0x%08x DMADBG_7=0x%08x\n",
+ 			AH_RX_STOP_DMA_TIMEOUT / 1000,