staging: clocking-wizard: Contain macro argument in parenthesis

A macro doing some arithmetic to calculate a register offset, did not
contain an argument to the macro in parentheses, potentially leading to
unexpected results when using that macro with arithmetic expressions as
argument.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c

@@ -29,7 +29,7 @@
 #define WZRD_NUM_OUTPUTS	7
 #define WZRD_ACLK_MAX_FREQ	250000000UL
 
-#define WZRD_CLK_CFG_REG(n)	(0x200 + 4 * n)
+#define WZRD_CLK_CFG_REG(n)	(0x200 + 4 * (n))
 
 #define WZRD_CLkOUT0_FRAC_EN	BIT(18)
 #define WZRD_CLkFBOUT_FRAC_EN	BIT(26)