selftests/mm: mkdirty: fix incorrect position of #endif

The #endif is the wrong side of a } causing a build failure when
__NR_userfaultfd is not defined.  Fix this by moving the #end to enclose
the }

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 9eac40f ("selftests/mm: mkdirty: test behavior of (pte|pmd)_mkdirty on VMAs without write permissions")
Signed-off-by: Colin Ian King <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ColinIanKing

tools/testing/selftests/mm/mkdirty.c

@@ -321,8 +321,8 @@ static void test_uffdio_copy(void)
 munmap:
 	munmap(dst, pagesize);
 	free(src);
-#endif /* __NR_userfaultfd */
 }
+#endif /* __NR_userfaultfd */
 
 int main(void)
 {