i2c: Fix sparse warnings for I2C_BOARD_INFO()

Since the first argument to I2C_BOARD_INFO() must be a string constant,
there is no need to parenthesise it, and adding parentheses results in
an invalid initialiser for char[].  gcc obviously accepts this syntax as
an extension, but sparse complains, e.g.:

drivers/net/sfc/boards.c:173:2: warning: array initialized from parenthesized string constant

Therefore, remove the parentheses.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 00ee11e..ad25805 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -274,7 +274,7 @@
  * are provided using conventional syntax.
  */
 #define I2C_BOARD_INFO(dev_type, dev_addr) \
-	.type = (dev_type), .addr = (dev_addr)
+	.type = dev_type, .addr = (dev_addr)
 
 
 /* Add-on boards should register/unregister their devices; e.g. a board