mm: usercopy: move the virt_addr_valid() below the is_vmalloc_addr()

The is_kmap_addr() and the is_vmalloc_addr() in the check_heap_object()
will not work, because the virt_addr_valid() will exclude the kmap and
vmalloc regions. So let's move the virt_addr_valid() below
the is_vmalloc_addr().

Signed-off-by: Yuanzheng Song <songyuanzheng@huawei.com>
Fixes: 4e140f59 ("mm/usercopy: Check kmap addresses properly")
Fixes: 0aef499f ("mm/usercopy: Detect vmalloc overruns")
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220505071037.4121100-1-songyuanzheng@huawei.com