ustat02: Fix EFAULT in 32bit compatibility mode

The size of dev_t is larger than 32 bits which causes the dev argument
to be passed incorrectly. On Arm this means that the EFAULT test case
actually returns EINVAL because the device number isn't recognised.

Signed-off-by: Steven Price <steven.price@arm.com>
Acked-by: Li Wang <liwang@redhat.com>

testcases/kernel/syscalls/ustat/ustat02.c

@@ -36,7 +36,7 @@ int TST_TOTAL = ARRAY_SIZE(tc);
 
 void run(unsigned int test)
 {
-	TEST(tst_syscall(__NR_ustat, *tc[test].dev, tc[test].buf));
+	TEST(tst_syscall(__NR_ustat, (unsigned int)*tc[test].dev, tc[test].buf));
 
 	if ((TST_RET == -1) && (TST_ERR == tc[test].exp_errno))
 		tst_res(TPASS | TTERRNO, "ustat(2) expected failure");