I used the clang-tidy qemu-round check to generate the fix:
https://github.com/elmarco/clang-tools-extra

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 hw/pci/msix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/pci/msix.c b/hw/pci/msix.c
index 5078d3dd19..c944c02135 100644
--- a/hw/pci/msix.c
+++ b/hw/pci/msix.c
@@ -438,7 +438,7 @@ void msix_save(PCIDevice *dev, QEMUFile *f)
     }
 
     qemu_put_buffer(f, dev->msix_table, n * PCI_MSIX_ENTRY_SIZE);
-    qemu_put_buffer(f, dev->msix_pba, (n + 7) / 8);
+    qemu_put_buffer(f, dev->msix_pba, DIV_ROUND_UP(n, 8));
 }
 
 /* Should be called after restoring the config space. */
@@ -453,7 +453,7 @@ void msix_load(PCIDevice *dev, QEMUFile *f)
 
     msix_clear_all_vectors(dev);
     qemu_get_buffer(f, dev->msix_table, n * PCI_MSIX_ENTRY_SIZE);
-    qemu_get_buffer(f, dev->msix_pba, (n + 7) / 8);
+    qemu_get_buffer(f, dev->msix_pba, DIV_ROUND_UP(n, 8));
     msix_update_function_masked(dev);
 
     for (vector = 0; vector < n; vector++) {
-- 
2.14.1.146.gd35faa819