kernel: mmu: Fix possible null de-reference

virt_page_phys_get can be called with phy parameter NULL when
the intention is just checking if a virtual address is mapped.

This function is generally overwritten by a an arch API that checks if
phys is null before using it but this default implementation doesn't.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
1 file changed