hw/isa/isa-bus: Replace hw_error() by assert()

As we can never have more than ISA_NUM_IRQS (16) ISA IRQs,
replace the not very interesting hw_error() call by an
assert() which is more useful to debug condition that can
not happen.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200901104043.91383-6-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/isa/isa-bus.c

@@ -21,7 +21,6 @@
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
-#include "hw/hw.h"
 #include "monitor/monitor.h"
 #include "hw/sysbus.h"
 #include "sysemu/sysemu.h"
@@ -85,18 +84,14 @@ void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
 {
     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
-    if (isairq >= ISA_NUM_IRQS) {
-        hw_error("isa irq %d invalid", isairq);
-    }
+    assert(isairq < ISA_NUM_IRQS);
     return isabus->irqs[isairq];
 }
 
 void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq)
 {
     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
-    if (isairq >= ISA_NUM_IRQS) {
-        hw_error("isa irq %d invalid", isairq);
-    }
+    assert(isairq < ISA_NUM_IRQS);
     dev->isairq[dev->nirqs] = isairq;
     *p = isa_get_irq(dev, isairq);
     dev->nirqs++;