sh/uaccess: fix sparse errors

virtio wants to read bitwise types from userspace using get_user.  At the
moment this triggers sparse errors, since the value is passed through an
integer.

Fix that up using __force.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

arch/sh/include/asm/uaccess.h

@@ -60,7 +60,7 @@ struct __large_struct { unsigned long buf[100]; };
 	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
 	__chk_user_ptr(ptr);					\
 	__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
-	(x) = (__typeof__(*(ptr)))__gu_val;			\
+	(x) = (__force __typeof__(*(ptr)))__gu_val;		\
 	__gu_err;						\
 })
 
@@ -71,7 +71,7 @@ struct __large_struct { unsigned long buf[100]; };
 	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\
 	if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))		\
 		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
-	(x) = (__typeof__(*(ptr)))__gu_val;				\
+	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
 	__gu_err;							\
 })