tests: Clean up wait for event

We still use hacks like qmp("") to wait for an event, even though we
have qmp_eventwait() since commit 8fe941f, and qmp_eventwait_ref()
since commit 7ffe312.  Both commits neglected to convert all the
existing hacks.  Make up what they missed.

Bonus: gets rid of empty format strings.  A step towards compile-time
format string checking without triggering -Wformat-zero-length.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
[thuth: dropped the hunks from the usb tests - not needed anymore]
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 1 insertions, 5 deletions

diff --git a/tests/libqos/pci-pc.c b/tests/libqos/pci-pc.c
index cd4e20e..368a8a6 100644
--- a/tests/libqos/pci-pc.c
+++ b/tests/libqos/pci-pc.c
@@ -173,9 +173,5 @@ void qpci_unplug_acpi_device_test(const char *id, uint8_t slot)
 
     outb(ACPI_PCIHP_ADDR + PCI_EJ_BASE, 1 << slot);
 
-    response = qmp("");
-    g_assert(response);
-    g_assert(qdict_haskey(response, "event"));
-    g_assert(!strcmp(qdict_get_str(response, "event"), "DEVICE_DELETED"));
-    QDECREF(response);
+    qmp_eventwait("DEVICE_DELETED");
 }