qdev: Use returned bool to check for qdev_realize() etc. failure

Convert

    foo(..., &err);
    if (err) {
        ...
    }

to

    if (!foo(..., &err)) {
        ...
    }

for qdev_realize(), qdev_realize_and_unref(), qbus_realize() and their
wrappers isa_realize_and_unref(), pci_realize_and_unref(),
sysbus_realize(), sysbus_realize_and_unref(), usb_realize_and_unref().
Coccinelle script:

    @@
    identifier fun = {
        isa_realize_and_unref, pci_realize_and_unref, qbus_realize,
        qdev_realize, qdev_realize_and_unref, sysbus_realize,
        sysbus_realize_and_unref, usb_realize_and_unref
    };
    expression list args, args2;
    typedef Error;
    Error *err;
    @@
    -    fun(args, &err, args2);
    -    if (err)
    +    if (!fun(args, &err, args2))
         {
             ...
         }

Chokes on hw/arm/musicpal.c's lcd_refresh() with the unhelpful error
message "no position information".  Nothing to convert there; skipped.

Fails to convert hw/arm/armsse.c, because Coccinelle gets confused by
ARMSSE being used both as typedef and function-like macro there.
Converted manually.

A few line breaks tidied up manually.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200707160613.848843-5-armbru@redhat.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/hw/arm/digic.c b/hw/arm/digic.c
index 13a83f7430..1494c2900a 100644
--- a/hw/arm/digic.c
+++ b/hw/arm/digic.c
@@ -62,15 +62,13 @@ static void digic_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    qdev_realize(DEVICE(&s->cpu), NULL, &err);
-    if (err != NULL) {
+    if (!qdev_realize(DEVICE(&s->cpu), NULL, &err)) {
         error_propagate(errp, err);
         return;
     }
 
     for (i = 0; i < DIGIC4_NB_TIMERS; i++) {
-        sysbus_realize(SYS_BUS_DEVICE(&s->timer[i]), &err);
-        if (err != NULL) {
+        if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer[i]), &err)) {
             error_propagate(errp, err);
             return;
         }
@@ -80,8 +78,7 @@ static void digic_realize(DeviceState *dev, Error **errp)
     }
 
     qdev_prop_set_chr(DEVICE(&s->uart), "chardev", serial_hd(0));
-    sysbus_realize(SYS_BUS_DEVICE(&s->uart), &err);
-    if (err != NULL) {
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->uart), &err)) {
         error_propagate(errp, err);
         return;
     }