tools/testing/vma: add missing function stub

The hugetlb fix introduced in commit ee40c99 ("mm: fix copy_vma()
error handling for hugetlb mappings") mistakenly did not provide a stub
for the VMA userland testing, which results in a compile error when trying
to build this.

Provide this stub to resolve the issue.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: ee40c99 ("mm: fix copy_vma() error handling for hugetlb mappings")
Signed-off-by: Lorenzo Stoakes <[email protected]>
Reviewed-by:  Liam R. Howlett <[email protected]>
Reviewed-by: Pedro Falcato <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: lorenzo-stoakes

tools/testing/vma/vma_internal.h

@@ -1461,4 +1461,9 @@ static inline int __call_mmap_prepare(struct file *file,
 	return file->f_op->mmap_prepare(desc);
 }
 
+static inline void fixup_hugetlb_reservations(struct vm_area_struct *vma)
+{
+	(void)vma;
+}
+
 #endif	/* __MM_VMA_INTERNAL_H */