Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: http://lists.infradead.org/pipermail/linux-arm-kernel/2023-May/832583.htmlSigned-off-by: Will Deacon <will@kernel.org>