libvhost-user: fix cast warnings on 32 bits

Fixes warnings:
 warning: cast to pointer from integer of different size
 [-Wint-to-pointer-cast]
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190514104126.6294-2-marcandre.lureau@redhat.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

contrib/libvhost-user/libvhost-user.c

@@ -621,7 +621,7 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
          * data that's already arrived in the shared process.
          * TODO: How to do hugepage
          */
-        ret = madvise((void *)dev_region->mmap_addr,
+        ret = madvise((void *)(uintptr_t)dev_region->mmap_addr,
                       dev_region->size + dev_region->mmap_offset,
                       MADV_DONTNEED);
         if (ret) {
@@ -633,7 +633,7 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
          * in neighbouring pages.
          * TODO: Turn this backon later.
          */
-        ret = madvise((void *)dev_region->mmap_addr,
+        ret = madvise((void *)(uintptr_t)dev_region->mmap_addr,
                       dev_region->size + dev_region->mmap_offset,
                       MADV_NOHUGEPAGE);
         if (ret) {
@@ -666,7 +666,7 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
         DPRINT("%s: region %d: Registered userfault for %llx + %llx\n",
                 __func__, i, reg_struct.range.start, reg_struct.range.len);
         /* Now it's registered we can let the client at it */
-        if (mprotect((void *)dev_region->mmap_addr,
+        if (mprotect((void *)(uintptr_t)dev_region->mmap_addr,
                      dev_region->size + dev_region->mmap_offset,
                      PROT_READ | PROT_WRITE)) {
             vu_panic(dev, "failed to mprotect region %d for postcopy (%s)",