net/cxgb3: remove undefined operations

Modifying an object twice without an intervening sequence point is
undefined.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/cxgb3/t3_hw.c

@@ -3683,7 +3683,7 @@ static void mc7_prep(struct adapter *adapter, struct mc7 *mc7,
 	mc7->name = name;
 	mc7->offset = base_addr - MC7_PMRX_BASE_ADDR;
 	cfg = t3_read_reg(adapter, mc7->offset + A_MC7_CFG);
-	mc7->size = mc7->size = G_DEN(cfg) == M_DEN ? 0 : mc7_calc_size(cfg);
+	mc7->size = G_DEN(cfg) == M_DEN ? 0 : mc7_calc_size(cfg);
 	mc7->width = G_WIDTH(cfg);
 }