hw/i386/pc_piix.c: remove unnecessary if() from pc_init1()

Now that the isapc logic has been split out of pc_piix.c, the PCI Host Bridge
(phb) object is now always set in pc_init1().

Since phb is now guaranteed not to be NULL, Coverity reports that the if()
statement surrounding ioapic_init_gsi() is now unnecessary and can be removed
along with the phb NULL initialiser.

Coverity: CID 1620557
Signed-off-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Fixes: 99d0630a45 ("hw/i386/pc_piix.c: assume pcmc->pci_enabled is always true in pc_init1()")
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250901203409.1196620-1-mark.caveayland@nutanix.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/i386/pc_piix.c

@@ -106,7 +106,7 @@ static void pc_init1(MachineState *machine, const char *pci_type)
     X86MachineState *x86ms = X86_MACHINE(machine);
     MemoryRegion *system_memory = get_system_memory();
     MemoryRegion *system_io = get_system_io();
-    Object *phb = NULL;
+    Object *phb;
     ISABus *isa_bus;
     Object *piix4_pm = NULL;
     qemu_irq smi_irq;
@@ -284,9 +284,7 @@ static void pc_init1(MachineState *machine, const char *pci_type)
         pc_i8259_create(isa_bus, gsi_state->i8259_irq);
     }
 
-    if (phb) {
-        ioapic_init_gsi(gsi_state, phb);
-    }
+    ioapic_init_gsi(gsi_state, phb);
 
     if (tcg_enabled()) {
         x86_register_ferr_irq(x86ms->gsi[13]);