hw/pci: remove return after g_assert_not_reached()

This patch is part of a series that moves towards a consistent use of
g_assert_not_reached() rather than an ad hoc mix of different
assertion mechanisms.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20240919044641.386068-29-pierrick.bouvier@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/pci/pci-stub.c

@@ -47,13 +47,11 @@ void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict)
 MSIMessage pci_get_msi_message(PCIDevice *dev, int vector)
 {
     g_assert_not_reached();
-    return (MSIMessage){};
 }
 
 uint16_t pci_requester_id(PCIDevice *dev)
 {
     g_assert_not_reached();
-    return 0;
 }
 
 /* Required by ahci.c */