pci: Make query-pci stub consistent with the real one

QMP query-pci and HMP info pci can behave differently when there are
no PCI devices.  They can report nothing, like this:

    qemu-system-aarch64 -S -M spitz -display none -monitor stdio
    QEMU 7.1.91 monitor - type 'help' for more information
    (qemu) info pci

Or they can fail, like this:

    qemu-system-microblaze -M petalogix-s3adsp1800 -display none -monitor stdio
    QEMU 7.1.91 monitor - type 'help' for more information
    (qemu) info pci
    PCI devices not supported

They fail when none of the target's machines supports PCI, i.e. when
we're using qmp_query_pci() from hw/pci/pci-stub.c.

The error is not useful, and reporting nothing makes sense, so do that
in pci-stub.c, too.

Now qmp_query_pci() can't fail anymore.  Drop the dead error handling
from hmp_info_pci().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20221201121133.3813857-5-armbru@redhat.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/hw/pci/pci-stub.c b/hw/pci/pci-stub.c
index 3a027c4..f29ecc9 100644
--- a/hw/pci/pci-stub.c
+++ b/hw/pci/pci-stub.c
@@ -21,9 +21,7 @@
 #include "qemu/osdep.h"
 #include "sysemu/sysemu.h"
 #include "monitor/monitor.h"
-#include "qapi/error.h"
 #include "qapi/qapi-commands-pci.h"
-#include "qapi/qmp/qerror.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/msi.h"
 #include "hw/pci/msix.h"
@@ -33,7 +31,6 @@ bool pci_available;
 
 PciInfoList *qmp_query_pci(Error **errp)
 {
-    error_setg(errp, QERR_UNSUPPORTED);
     return NULL;
 }