e1000: fix bugs from recent commits

Commit 114d7fc0 "e1000: Rewrite EEPROM checksum error to give more
information" failed to initialize the checksum variable which should
result in random results. Fix that.

Commit 2326a94d caused a ton of "unused variable 'x'" warnings.
Fix these.  While we are at it, remove some bogus parens.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Tested-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>

drivers/net/e1000.c

@@ -884,6 +884,7 @@ static int e1000_validate_eeprom_checksum(struct e1000_hw *hw)
 	}
 
 	/* Compute the checksum */
+	checksum = 0;
 	for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
 		checksum += buf[i];
 	checksum = ((uint16_t)EEPROM_SUM) - checksum;

drivers/net/e1000.h

@@ -62,15 +62,15 @@
 
 /* I/O wrapper functions */
 #define E1000_WRITE_REG(a, reg, value) \
-	(writel((value), ((a)->hw_addr + E1000_##reg)))
+	writel((value), ((a)->hw_addr + E1000_##reg))
 #define E1000_READ_REG(a, reg) \
-	(readl((a)->hw_addr + E1000_##reg))
+	readl((a)->hw_addr + E1000_##reg)
 #define E1000_WRITE_REG_ARRAY(a, reg, offset, value) \
-	(writel((value), ((a)->hw_addr + E1000_##reg + ((offset) << 2))))
+	writel((value), ((a)->hw_addr + E1000_##reg + ((offset) << 2)))
 #define E1000_READ_REG_ARRAY(a, reg, offset) \
-	(readl((a)->hw_addr + E1000_##reg + ((offset) << 2)))
+	readl((a)->hw_addr + E1000_##reg + ((offset) << 2))
 #define E1000_WRITE_FLUSH(a) \
-	do { uint32_t x = E1000_READ_REG(a, STATUS); } while (0)
+	do { E1000_READ_REG(a, STATUS); } while (0)
 
 /* Forward declarations of structures used by the shared code */
 struct e1000_hw;