staging: et131x: Remove cached_mask_value from et131x_adapter

cached_mask_value is only ever assigned, never read. Remove it.
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/et131x/et131x_adapter.h

@@ -200,8 +200,6 @@ struct et131x_adapter {
 	u16 pdown_speed;
 	u8 pdown_duplex;
 
-	u32 cached_mask_value;
-
 	/* Xcvr status at last poll */
 	u16 bmsr;
 

drivers/staging/et131x/et131x_isr.c

@@ -125,7 +125,6 @@ void et131x_enable_interrupts(struct et131x_adapter *adapter)
 	else
 		mask = INT_MASK_ENABLE_NO_FLOW;
 
-	adapter->cached_mask_value = mask;
 	writel(mask, &adapter->regs->global.int_mask);
 }
 
@@ -139,7 +138,6 @@ void et131x_enable_interrupts(struct et131x_adapter *adapter)
 void et131x_disable_interrupts(struct et131x_adapter *adapter)
 {
 	/* Disable all global interrupts */
-	adapter->cached_mask_value = INT_MASK_DISABLE;
 	writel(INT_MASK_DISABLE, &adapter->regs->global.int_mask);
 }