drivers/net/mvgbe.c: Fix GCC 4.6 warnings

Fix:
mvgbe.c: In function 'mvgbe_send':
mvgbe.c:555:2: warning: dereferencing type-punned pointer will
break strict-aliasing rules [-Wstrict-aliasing]
mvgbe.c: In function 'mvgbe_recv':
mvgbe.c:640:2: warning: dereferencing type-punned pointer will
break strict-aliasing rules [-Wstrict-aliasing]

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Acked-By: Prafulla Wadaskar <prafulla@marvell.com>

drivers/net/mvgbe.c

@@ -531,6 +531,7 @@ static int mvgbe_send(struct eth_device *dev, void *dataptr,
 	struct mvgbe_txdesc *p_txdesc = dmvgbe->p_txdesc;
 	void *p = (void *)dataptr;
 	u32 cmd_sts;
+	u32 txuq0_reg_addr;
 
 	/* Copy buffer if it's misaligned */
 	if ((u32) dataptr & 0x07) {
@@ -552,7 +553,8 @@ static int mvgbe_send(struct eth_device *dev, void *dataptr,
 	p_txdesc->byte_cnt = datasize;
 
 	/* Set this tc desc as zeroth TXUQ */
-	MVGBE_REG_WR(regs->tcqdp[TXUQ], (u32) p_txdesc);
+	txuq0_reg_addr = (u32)&regs->tcqdp[TXUQ];
+	writel((u32) p_txdesc, txuq0_reg_addr);
 
 	/* ensure tx desc writes above are performed before we start Tx DMA */
 	isb();
@@ -583,6 +585,7 @@ static int mvgbe_recv(struct eth_device *dev)
 	struct mvgbe_rxdesc *p_rxdesc_curr = dmvgbe->p_rxdesc_curr;
 	u32 cmd_sts;
 	u32 timeout = 0;
+	u32 rxdesc_curr_addr;
 
 	/* wait untill rx packet available or timeout */
 	do {
@@ -637,8 +640,8 @@ static int mvgbe_recv(struct eth_device *dev)
 	p_rxdesc_curr->buf_size = PKTSIZE_ALIGN;
 	p_rxdesc_curr->byte_cnt = 0;
 
-	writel((unsigned)p_rxdesc_curr->nxtdesc_p,
-		(u32) &dmvgbe->p_rxdesc_curr);
+	rxdesc_curr_addr = (u32)&dmvgbe->p_rxdesc_curr;
+	writel((unsigned)p_rxdesc_curr->nxtdesc_p, rxdesc_curr_addr);
 
 	return 0;
 }