bitops: Add missing parentheses to new get_order macro

The new get_order macro introcuded in commit

	d66acc39c7cee323733c8503b9de1821a56dff7e

does not use parentheses around all uses of the parameter n.
This causes new compile warnings, for example in the
amd_iommu_init.c function:

drivers/iommu/amd_iommu_init.c:561:6: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]
drivers/iommu/amd_iommu_init.c:561:6: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]

Fix those warnings by adding the missing parentheses.

Reported-by: Ingo Molnar <mingo@elte.hu>
Cc: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Link: http://lkml.kernel.org/r/1330088295-28732-1-git-send-email-joerg.roedel@amd.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

include/asm-generic/getorder.h

@@ -49,8 +49,8 @@ int __get_order(unsigned long size)
 #define get_order(n)						\
 (								\
 	__builtin_constant_p(n) ? (				\
-		(n == 0UL) ? BITS_PER_LONG - PAGE_SHIFT :	\
-		((n < (1UL << PAGE_SHIFT)) ? 0 :		\
+		((n) == 0UL) ? BITS_PER_LONG - PAGE_SHIFT :	\
+		(((n) < (1UL << PAGE_SHIFT)) ? 0 :		\
 		 ilog2((n) - 1) - PAGE_SHIFT + 1)		\
 	) :							\
 	__get_order(n)						\