nommu: pass NULL argument to vma_iter_prealloc()

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SUSE CVE-2024-53109

In the Linux kernel, the following vulnerability has been resolved: nommu: pass NULL argument to vmaiterprealloc When deleting a vma entry from a maple tree, it has to pass NULL to vmaiterprealloc in order to calculate internal state of the tree, but it passed a wrong argument. As a result, nommu...